Mathieu Poirier [Tue, 2 Feb 2016 21:14:00 +0000 (14:14 -0700)]
coresight: removing bind/unbind options from sysfs
The coresight drivers have absolutely no control over bind and unbind
operations triggered from sysfs. The operations simply can't be
cancelled or denied event when one or several tracing sessions are
under way. Since the memory associated to individual device is
invariably freed, the end result is a kernel crash when the path from
source to sink is travelled again as demonstrated here[1].
One solution could be to keep track of all the path (i.e tracing
session) that get created and iterate through the elements of those path
looking for the coresight device that is being removed. This proposition
doesn't scale well since there is no upper bound on the amount of
concurrent trace session that can be created.
With the above in mind, this patch prevent devices from being unbounded
from their driver by using the driver->suppress_bind_attr option. That way
trace sessions can be managed without fearing to loose devices.
Since device can't be removed anymore the xyz_remove() functions found in
each driver is also removed.
[1]. http://www.spinics.net/lists/arm-kernel/msg474952.html
Reported-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
b15f0fb657e040401d875d11ae13b269af8a16e0)
Mathieu Poirier [Tue, 2 Feb 2016 21:13:59 +0000 (14:13 -0700)]
coresight: remove csdev's link from topology
In function 'coresight_unregister()', all references to the csdev that
is being taken away need to be removed from the topology. Otherwise
building the next coresight path from source to sink may use memory
that has been released.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
ad725aee070caf8fa93d84d6fb78321f9642db18)
Mathieu Poirier [Tue, 2 Feb 2016 21:13:58 +0000 (14:13 -0700)]
coresight: release reference taken by 'bus_find_device()'
The reference count taken by function bus_find_device() needs
to be released if a child device is found, something this patch
is adding.
Reported-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
f2dfab3568fc32afeac8b698481e80e7ab2dc658)
Mathieu Poirier [Tue, 2 Feb 2016 21:13:57 +0000 (14:13 -0700)]
coresight: coresight_unregister() function cleanup
In its current form the code never frees csdev->refcnt allocated
in coresight_register(). There is also a problem with csdev->conns
that is freed before device_unregister() rather than in the device
release function.
This patch addresses both issues by moving kfree(csdev->conns) to
coresight_device_release() and freeing csdev->refcnt, also in
the same function.
Reported-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
fae54158792aec705620bdc3938d342879204f0c)
Mathieu Poirier [Tue, 2 Feb 2016 21:13:56 +0000 (14:13 -0700)]
coresight: fixing lockdep error
On some platform the following lockdep error occurs when doing simple
manipulations:
[ 23.197021]
[ 23.198608] ======================================================
[ 23.205078] [ INFO: possible circular locking dependency detected ]
[ 23.211639]
4.4.0-rc8-00025-gbbf360b #172 Not tainted
[ 23.216918] -------------------------------------------------------
[ 23.223480] sh/858 is trying to acquire lock:
[ 23.228057] (coresight_mutex){+.+.+.}, at: [<
c0415d40>] coresight_enable+0x1c/0x1b4
[ 23.236206]
[ 23.236206] but task is already holding lock:
[ 23.242309] (s_active#52){++++.+}, at: [<
c01d4b40>] kernfs_fop_write+0x5c/0x1c0
[ 23.250122]
[ 23.250122] which lock already depends on the new lock.
[ 23.250122]
[ 23.258697]
[ 23.258697] the existing dependency chain (in reverse order) is:
[ 23.266510]
-> #1 (s_active#52){++++.+}:
[ 23.270843] [<
c01d30ec>] __kernfs_remove+0x294/0x35c
[ 23.276672] [<
c01d3e44>] kernfs_remove_by_name_ns+0x44/0x8c
[ 23.283172] [<
c01d6318>] remove_files+0x3c/0x84
[ 23.288543] [<
c01d66b4>] sysfs_remove_group+0x48/0x9c
[ 23.294494] [<
c01d6734>] sysfs_remove_groups+0x2c/0x3c
[ 23.300506] [<
c030b658>] device_remove_attrs+0x5c/0x74
[ 23.306549] [<
c030c290>] device_del+0x110/0x218
[ 23.311950] [<
c030c3c4>] device_unregister+0x2c/0x6c
[ 23.317779] [<
c04156d8>] coresight_unregister+0x30/0x40
[ 23.323883] [<
c041a290>] etm_probe+0x228/0x2e8
[ 23.329193] [<
c02bc760>] amba_probe+0xe4/0x160
[ 23.334503] [<
c0310540>] driver_probe_device+0x23c/0x480
[ 23.340728] [<
c0310820>] __driver_attach+0x9c/0xa0
[ 23.346374] [<
c030e400>] bus_for_each_dev+0x70/0xa4
[ 23.352142] [<
c030fcf4>] driver_attach+0x24/0x28
[ 23.357604] [<
c030f86c>] bus_add_driver+0x1e0/0x278
[ 23.363372] [<
c0310d48>] driver_register+0x80/0x100
[ 23.369110] [<
c02bc508>] amba_driver_register+0x58/0x5c
[ 23.375244] [<
c0749514>] etm_driver_init+0x18/0x1c
[ 23.380889] [<
c0009918>] do_one_initcall+0xc4/0x20c
[ 23.386657] [<
c0715e7c>] kernel_init_freeable+0x160/0x208
[ 23.392974] [<
c052d7fc>] kernel_init+0x18/0xf0
[ 23.398254] [<
c0010850>] ret_from_fork+0x14/0x24
[ 23.403747]
-> #0 (coresight_mutex){+.+.+.}:
[ 23.408447] [<
c008ed60>] lock_acquire+0xe4/0x210
[ 23.413909] [<
c0530a30>] mutex_lock_nested+0x74/0x450
[ 23.419860] [<
c0415d40>] coresight_enable+0x1c/0x1b4
[ 23.425689] [<
c0416030>] enable_source_store+0x58/0x68
[ 23.431732] [<
c030b358>] dev_attr_store+0x20/0x2c
[ 23.437286] [<
c01d55e8>] sysfs_kf_write+0x50/0x54
[ 23.442871] [<
c01d4ba8>] kernfs_fop_write+0xc4/0x1c0
[ 23.448699] [<
c015b60c>] __vfs_write+0x34/0xe4
[ 23.454040] [<
c015bf38>] vfs_write+0x98/0x174
[ 23.459228] [<
c015c7a8>] SyS_write+0x4c/0xa8
[ 23.464355] [<
c00107c0>] ret_fast_syscall+0x0/0x1c
[ 23.470031]
[ 23.470031] other info that might help us debug this:
[ 23.470031]
[ 23.478393] Possible unsafe locking scenario:
[ 23.478393]
[ 23.484619] CPU0 CPU1
[ 23.489349] ---- ----
[ 23.494079] lock(s_active#52);
[ 23.497497] lock(coresight_mutex);
[ 23.503906] lock(s_active#52);
[ 23.509918] lock(coresight_mutex);
[ 23.513702]
[ 23.513702] *** DEADLOCK ***
[ 23.513702]
[ 23.519897] 3 locks held by sh/858:
[ 23.523529] #0: (sb_writers#7){.+.+.+}, at: [<
c015ec38>] __sb_start_write+0xa8/0xd4
[ 23.531799] #1: (&of->mutex){+.+...}, at: [<
c01d4b38>] kernfs_fop_write+0x54/0x1c0
[ 23.539916] #2: (s_active#52){++++.+}, at: [<
c01d4b40>] kernfs_fop_write+0x5c/0x1c0
[ 23.548156]
[ 23.548156] stack backtrace:
[ 23.552734] CPU: 0 PID: 858 Comm: sh Not tainted
4.4.0-rc8-00025-gbbf360b #172
[ 23.560302] Hardware name: Generic OMAP4 (Flattened Device Tree)
[ 23.566589] Backtrace:
[ 23.569152] [<
c00154d4>] (dump_backtrace) from [<
c00156d0>] (show_stack+0x18/0x1c)
[ 23.577087] r7:
ed4b8570 r6:
c0936400 r5:
c07ae71c r4:
00000000
[ 23.583038] [<
c00156b8>] (show_stack) from [<
c027e69c>] (dump_stack+0x98/0xc0)
[ 23.590606] [<
c027e604>] (dump_stack) from [<
c008a750>] (print_circular_bug+0x21c/0x33c)
[ 23.599090] r5:
c0939d60 r4:
c0936400
[ 23.602874] [<
c008a534>] (print_circular_bug) from [<
c008e370>] (__lock_acquire+0x1c98/0x1d88)
[ 23.611877] r10:
00000003 r9:
c0fd7a5c r8:
ed4b8550 r7:
ed4b8570 r6:
ed4b8000 r5:
c0ff69e4
[ 23.620117] r4:
c0936400 r3:
ed4b8550
[ 23.623901] [<
c008c6d8>] (__lock_acquire) from [<
c008ed60>] (lock_acquire+0xe4/0x210)
[ 23.632080] r10:
00000000 r9:
00000000 r8:
60000013 r7:
c07cb7b4 r6:
00000001 r5:
00000000
[ 23.640350] r4:
00000000
[ 23.643005] [<
c008ec7c>] (lock_acquire) from [<
c0530a30>] (mutex_lock_nested+0x74/0x450)
[ 23.651458] r10:
ecc0bf80 r9:
edbe7dcc r8:
ed4b8000 r7:
c0fd7a5c r6:
c0415d40 r5:
00000000
[ 23.659729] r4:
c07cb780
[ 23.662384] [<
c05309bc>] (mutex_lock_nested) from [<
c0415d40>] (coresight_enable+0x1c/0x1b4)
[ 23.671234] r10:
ecc0bf80 r9:
edbe7dcc r8:
ed733c00 r7:
00000000 r6:
ed733c00 r5:
00000002
[ 23.679473] r4:
ed762140
[ 23.682128] [<
c0415d24>] (coresight_enable) from [<
c0416030>] (enable_source_store+0x58/0x68)
[ 23.691070] r7:
00000000 r6:
ed733c00 r5:
00000002 r4:
ed762160
[ 23.697052] [<
c0415fd8>] (enable_source_store) from [<
c030b358>] (dev_attr_store+0x20/0x2c)
[ 23.705780] r5:
edbe7dc0 r4:
c0415fd8
[ 23.709533] [<
c030b338>] (dev_attr_store) from [<
c01d55e8>] (sysfs_kf_write+0x50/0x54)
[ 23.717834] r5:
edbe7dc0 r4:
c030b338
[ 23.721618] [<
c01d5598>] (sysfs_kf_write) from [<
c01d4ba8>] (kernfs_fop_write+0xc4/0x1c0)
[ 23.730163] r7:
00000000 r6:
00000000 r5:
00000002 r4:
edbe7dc0
[ 23.736145] [<
c01d4ae4>] (kernfs_fop_write) from [<
c015b60c>] (__vfs_write+0x34/0xe4)
[ 23.744323] r10:
00000000 r9:
ecc0a000 r8:
c0010964 r7:
ecc0bf80 r6:
00000002 r5:
c01d4ae4
[ 23.752593] r4:
ee385a40
[ 23.755249] [<
c015b5d8>] (__vfs_write) from [<
c015bf38>] (vfs_write+0x98/0x174)
[ 23.762908] r9:
ecc0a000 r8:
c0010964 r7:
ecc0bf80 r6:
000ab0d8 r5:
00000002 r4:
ee385a40
[ 23.771057] [<
c015bea0>] (vfs_write) from [<
c015c7a8>] (SyS_write+0x4c/0xa8)
[ 23.778442] r8:
c0010964 r7:
00000002 r6:
000ab0d8 r5:
ee385a40 r4:
ee385a40
[ 23.785522] [<
c015c75c>] (SyS_write) from [<
c00107c0>] (ret_fast_syscall+0x0/0x1c)
[ 23.793457] r7:
00000004 r6:
00000001 r5:
000ab0d8 r4:
00000002
[ 23.799652] coresight-etb10
54162000.etb: ETB enabled
[ 23.805084] coresight-funnel
54164000.funnel: FUNNEL inport 0 enabled
[ 23.811859] coresight-replicator
44000000.ocp:replicator: REPLICATOR enabled
[ 23.819335] coresight-funnel
54158000.funnel: FUNNEL inport 0 enabled
[ 23.826110] coresight-etm3x
5414c000.ptm: ETM tracing enabled
The locking in coresight_unregister() is not required as the only customers of
the function are drivers themselves when an initialisation failure has been
encoutered.
Reported-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
a9ddc71f5840c2711e530f2e055b278f79948b29)
Mathieu Poirier [Tue, 2 Feb 2016 21:13:55 +0000 (14:13 -0700)]
coresight: fixing indentation problem
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
ff8742279ff163e36ee50bb4e75090af1d7d6e3b)
Andrew F. Davis [Thu, 17 Dec 2015 15:47:02 +0000 (08:47 -0700)]
coresight: Fix a typo in Kconfig
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
b9884d3b79f60846cdf04be262d13bca8996f99a)
Mathieu Poirier [Thu, 17 Dec 2015 15:47:02 +0000 (08:47 -0700)]
coresight: checking for NULL string in coresight_name_match()
Connection child names associated to ports can sometimes be NULL,
which is the case when booting a system on QEMU or when the Coresight
power domain isn't switched on.
This patch is adding a check to make sure a NULL string isn't fed
to strcmp(), something that avoid crashing the system.
Cc: <stable@vger.kernel.org> # v3.18+
Reported-by: Tyler Baker <tyler.baker@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
fadf3a44e974b030e7145218ad1ab25e3ef91738)
Alexander Shishkin [Tue, 10 May 2016 13:18:33 +0000 (16:18 +0300)]
perf/core: Disable the event on a truncated AUX record
When the PMU driver reports a truncated AUX record, it effectively means
that there is no more usable room in the event's AUX buffer (even though
there may still be some room, so that perf_aux_output_begin() doesn't take
action). At this point the consumer still has to be woken up and the event
has to be disabled, otherwise the event will just keep spinning between
perf_aux_output_begin() and perf_aux_output_end() until its context gets
unscheduled.
Again, for cpu-wide events this means never, so once in this condition,
they will be forever losing data.
Fix this by disabling the event and waking up the consumer in case of a
truncated AUX record.
Reported-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1462886313-13660-3-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit
9f448cd3cbcec8995935e60b27802ae56aac8cc0)
Alexander Shishkin [Mon, 21 Mar 2016 08:02:42 +0000 (10:02 +0200)]
perf/core: Don't leak event in the syscall error path
In the error path, event_file not being NULL is used to determine
whether the event itself still needs to be free'd, so fix it up to
avoid leaking.
Reported-by: Leon Yu <chianglungyu@gmail.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 130056275ade ("perf: Do not double free")
Link: http://lkml.kernel.org/r/87twk06yxp.fsf@ashishki-desk.ger.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit
201c2f85bd0bc13b712d9c0b3d11251b182e06ae)
Alexander Shishkin [Wed, 2 Mar 2016 11:24:14 +0000 (13:24 +0200)]
perf/core: Fix perf_sched_count derailment
The error path in perf_event_open() is such that asking for a sampling
event on a PMU that doesn't generate interrupts will end up in dropping
the perf_sched_count even though it hasn't been incremented for this
event yet.
Given a sufficient amount of these calls, we'll end up disabling
scheduler's jump label even though we'd still have active events in the
system, thereby facilitating the arrival of the infernal regions upon us.
I'm fixing this by moving account_event() inside perf_event_alloc().
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1456917854-29427-1-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit
927a5570855836e5d5859a80ce7e91e963545e8f)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:10 +0000 (19:12 +0200)]
stm class: dummy_stm: Add link callback for fault injection
STM device's link callback has the power to abort master/channel
assignment by returning a negative error code. Use this in dummy
stm device to optionally abort assigning certain channel IDs.
This is useful as fault injection into the stm class core, for
testing purposes.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
adcde635f5d6b77e9f11087af09c6f62da2bf108)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:09 +0000 (19:12 +0200)]
stm class: Plug stm device's unlink callback
STM device's unlink callback is never actually called from anywhere in
the stm class code.
This patch adds calls to stm driver's unlink method after the unlinking
has succeeded.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
cc8424074e51355e0c6ba717d8edc50d408f2802)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:08 +0000 (19:12 +0200)]
stm class: Fix a race in unlinking
There is a window in stm_source_link_drop(), during which the source's
link may change before locks are acquired. When this happens, it throws
a warning, since this is not an expected scenario.
This patch handles the race in such a way that if the link appears to
have changed by the time we took the locks, it will release them and
repeat the whole unlinking procedure from the beginning, unless the
other contender beat us to it.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
b4ca34aaf78ed0cdfc15956d377064104257a437)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:07 +0000 (19:12 +0200)]
stm class: Fix unbalanced module/device refcounting
STM code takes references to the stm device and its module for the
duration of the character device's existence or the stm_source link.
Dropping these references is not well balanced everywhere, which may
lead to leaks.
This patch balances the acquisition and releasing of these two
references and annotates each site so that it's easier to verify
correctness by reading the code.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
f7c81c7176c72c7899390754b4b038a64b296e4d)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:06 +0000 (19:12 +0200)]
stm class: Guard output assignment against concurrency
It is possible to concurrently assign the same output (a character
device writer or an stm_source device) to different stm devices,
which sets off a strategically placed warning in stm_output_assign().
To avoid this, use a spinlock to serialize (un)assignments between
outputs and stm devices.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
cde4ad8368840e414ecf67db258fe1dabaa5fd2e)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:05 +0000 (19:12 +0200)]
stm class: Fix unlocking braino in the error path
If an illegal attempt is made to unlink stm source device from an
stm device, the stm device's link spinlock mistakenly remains locked.
While this really shouldn't happen (there's a warning in place), the
locking should remain in order so that we can still recover from this
situation if it indeed does happen.
This patch unifies the unlocking in the exit path of
__stm_source_link_drop() to fix this.
Reported-by: Laurent Fert <laurent.fert@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
1810f2c44817c74ca3d05d1e3981e3a2e2ceb6f5)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:04 +0000 (19:12 +0200)]
stm class: Add heartbeat stm source device
Heartbeat stm source may have multiple instances (for connecting to
different stm devices). Each instance will send a periodic test message
over its stm device when it is linked. This can be used for testing stm
class framework, stm device drivers or as a heartbeat over the stm link.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
1192918530381b5cfc0e5da51233fa94f783b221)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:03 +0000 (19:12 +0200)]
stm class: dummy_stm: Create multiple devices
STM framework should be able to handle multiple STM devices at a time,
each one with its own master allocation policy.
This patch changes dummy_stm driver to create multiple STM sinks to
help testing the framework.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
bcfdf8afdebe63a2217fa632ae94f8aeecf9126f)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:02 +0000 (19:12 +0200)]
stm class: Support devices with multiple instances
By convention, the name of the stm policy directory in configfs consists of
the device name to which it applies and the actual policy name, separated
by a dot. Now, some devices already have dots in their names that separate
name of the actual device from its instance identifier. Such devices will
result in two (or more, who can tell) dots in the policy directory name.
Existing policy code, however, will treat the first dot as the one that
separates device name from policy name, therefore failing the above case.
This patch makes the last dot in the directory name be the separator, thus
prohibiting dots from being used in policy names.
Suggested-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
59be422e4ce10e3d49d4c9407a80fab8a9b7bc84)
Alexander Shishkin [Mon, 15 Feb 2016 17:12:01 +0000 (19:12 +0200)]
stm class: Use driver's packet callback return value
STM drivers provide a callback to generate/send individual STP packets;
it also tells the stm core how many bytes of payload it has consumed.
However, we would also need to use the negative space of this return
value to communicate errors that occur during the packet generation,
in which case the stm core will have to take appropriate action.
For now, we need to account for the possibility that the stm driver may
not support certain combinations of packet type/flags, in which case
it is expected to signal an error.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
f8560a9bc76b2cd5c06fa412cb7b5481d70fcf34)
Alexander Shishkin [Tue, 22 Dec 2015 15:25:21 +0000 (17:25 +0200)]
stm class: Prevent user-controllable allocations
Currently, the character device write method allocates a temporary buffer
for user's data, but the user's data size is not sanitized and can cause
arbitrarily large allocations via kzalloc() or an integer overflow that
will then result in overwriting kernel memory.
This patch trims the input buffer size to avoid these issues.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
f08b18266c7116e2ec6885dd53a928f580060a71)
Alexander Shishkin [Tue, 22 Dec 2015 15:25:19 +0000 (17:25 +0200)]
stm class: Fix link list locking
Currently, the list of stm_sources linked to an stm device is protected by
a spinlock, which also means that sources' .unlink() method is called under
this spinlock. However, this method may (and does) sleep, which means
trouble.
This patch slightly reworks locking around stm::link_list so that bits that
might_sleep() are called with a mutex held instead. Modification of this
list requires both mutex and spinlock to be held, while looking at the list
can be done under either mutex or spinlock.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
c74f7e8281add80bdfa0ad2998b8df287b13df73)
Alexander Shishkin [Tue, 22 Dec 2015 15:25:18 +0000 (17:25 +0200)]
stm class: Fix locking in unbinding policy path
Right now, if stm device removal has to unbind from a policy (that is,
an stm device that has STP policy, gets removed), it will trigger a
nested lock on the stm device's policy mutex.
This patch fixes the problem by moving the locking from the policy
unbinding to policy removal (configfs path), where it's actually needed;
the other caller of the policy unbinding function already takes the
mutex around the call.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
4c127fd16e6b33ecb7badc091480c84ea9aebeb6)
Arnd Bergmann [Tue, 22 Dec 2015 15:25:17 +0000 (17:25 +0200)]
stm class: Select CONFIG_SRCU
The newly added STM code uses SRCU, but does not ensure that
this code is part of the kernel:
drivers/built-in.o: In function `stm_source_link_show':
include/linux/srcu.h:221: undefined reference to `__srcu_read_lock'
include/linux/srcu.h:238: undefined reference to `__srcu_read_unlock'
drivers/built-in.o: In function `stm_source_link_drop':
include/linux/srcu.h:221: undefined reference to `__srcu_read_lock'
include/linux/srcu.h:238: undefined reference to `__srcu_read_unlock'
This adds a Kconfig 'select' statement like all the other SRCU using
drivers have.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
042d4460b5b4379a12f375045ff9065cf6758735)
Geert Uytterhoeven [Tue, 22 Dec 2015 15:25:15 +0000 (17:25 +0200)]
stm class: Hide STM-specific options if STM is disabled
If STM=n, it doesn't make sense to ask about STM_DUMMY and
STM_SOURCE_CONSOLE support, which are not even built when enabled
anyway. Hence hide these options if STM=n.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit
4a2e2b19f96acfc037a9773c7729d133ce1e7e3b)
Alexander Shishkin [Tue, 19 Jan 2016 15:14:29 +0000 (17:14 +0200)]
perf: Synchronously free aux pages in case of allocation failure
We are currently using asynchronous deallocation in the error path in
AUX mmap code, which is unnecessary and also presents a problem for users
that wish to probe for the biggest possible buffer size they can get:
they'll get -EINVAL on all subsequent attemts to allocate a smaller
buffer before the asynchronous deallocation callback frees up the pages
from the previous unsuccessful attempt.
Currently, gdb does that for allocating AUX buffers for Intel PT traces.
More specifically, overwrite mode of AUX pmus that don't support hardware
sg (some implementations of Intel PT, for instance) is limited to only
one contiguous high order allocation for its buffer and there is no way
of knowing its size without trying.
This patch changes error path freeing to be synchronous as there won't
be any contenders for the AUX pages at that point.
Reported-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1453216469-9509-1-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
(cherry picked from commit
45c815f06b80031659c63d7b93e580015d6024dd)
Linus Torvalds [Sun, 10 Jan 2016 23:01:32 +0000 (15:01 -0800)]
Linux 4.4
Linus Torvalds [Sat, 9 Jan 2016 22:53:48 +0000 (14:53 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi
Pull SCSI fix from James Bottomley:
"A single fix for machines with pages > 4k (PPC mostly).
There's a bug in our optimal transfer size code where we don't account
for pages > 4k and can set the transfer size to be less than the page
size causing nasty failures"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
sd: Reject optimal transfer length smaller than page size
Linus Torvalds [Sat, 9 Jan 2016 22:44:44 +0000 (14:44 -0800)]
Merge tag 'pci-v4.4-fixes-4' of git://git./linux/kernel/git/helgaas/pci
Pull PCI fixlet from Bjorn Helgaas:
"This marks the TI DRA7xx host bridge driver as broken. Apparently it
has never worked without some additional out-of-tree code, so I'm
going to mark it broken now and remove it completely next cycle unless
it's fixed"
* tag 'pci-v4.4-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI: dra7xx: Mark driver as broken
Michal Hocko [Fri, 8 Jan 2016 10:18:29 +0000 (11:18 +0100)]
vmstat: allocate vmstat_wq before it is used
kernel test robot has reported the following crash:
BUG: unable to handle kernel NULL pointer dereference at
00000100
IP: [<
c1074df6>] __queue_work+0x26/0x390
*pdpt =
0000000000000000 *pde =
f000ff53f000ff53 *pde =
f000ff53f000ff53
Oops: 0000 [#1] PREEMPT PREEMPT SMP SMP
CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted
4.4.0-rc4-00139-g373ccbe #1
Workqueue: events vmstat_shepherd
task:
cb684600 ti:
cb7ba000 task.ti:
cb7ba000
EIP: 0060:[<
c1074df6>] EFLAGS:
00010046 CPU: 0
EIP is at __queue_work+0x26/0x390
EAX:
00000046 EBX:
cbb37800 ECX:
cbb37800 EDX:
00000000
ESI:
00000000 EDI:
00000000 EBP:
cb7bbe68 ESP:
cb7bbe38
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
CR0:
8005003b CR2:
00000100 CR3:
01fd5000 CR4:
000006b0
Stack:
Call Trace:
__queue_delayed_work+0xa1/0x160
queue_delayed_work_on+0x36/0x60
vmstat_shepherd+0xad/0xf0
process_one_work+0x1aa/0x4c0
worker_thread+0x41/0x440
kthread+0xb0/0xd0
ret_from_kernel_thread+0x21/0x40
The reason is that start_shepherd_timer schedules the shepherd work item
which uses vmstat_wq (vmstat_shepherd) before setup_vmstat allocates
that workqueue so if the further initialization takes more than HZ we
might end up scheduling on a NULL vmstat_wq. This is really unlikely
but not impossible.
Fixes: 373ccbe59270 ("mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress")
Reported-by: kernel test robot <ying.huang@linux.intel.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: stable@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sat, 9 Jan 2016 00:11:05 +0000 (16:11 -0800)]
Merge tag 'fixes-for-linus' of git://git./linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Arnd Bergmann:
"This is the final small set of ARM SoC bug fixes for linux-4.4, almost
all regressions:
OMAP:
- data corruption on the Nokia N900 flash
Allwinner:
- Two defconfig change to get USB working again
ARM Versatile:
- Interrupt numbers gone bad after an older bug fix
Nomadik:
- Crashes from incorrect L2 cache settings
VIA vt8500:
- SD/MMC support on WM8650 never worked"
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
dts: vt8500: Add SDHC node to DTS file for WM8650
ARM: Fix broken USB support in multi_v7_defconfig for sunxi devices
ARM: versatile: fix MMC/SD interrupt assignment
ARM: nomadik: set latencies to 8 cycles
ARM: OMAP2+: Fix onenand rate detection to avoid filesystem corruption
ARM: Fix broken USB support in sunxi_defconfig
Linus Torvalds [Fri, 8 Jan 2016 23:58:14 +0000 (15:58 -0800)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm
Pull KVM fix from Paolo Bonzini:
"A simple fix. I'm sending it before the merge window, because it
refines a patch found in your master branch but not yet in the
kvm/next branch that is destined for 4.5"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
kvm: x86: only channel 0 of the i8254 is linked to the HPET
Linus Torvalds [Fri, 8 Jan 2016 23:50:59 +0000 (15:50 -0800)]
Merge tag 'pm+acpi-4.4-final' of git://git./linux/kernel/git/rafael/linux-pm
Pull ACPI fix from Rafael Wysocki:
"Just one obvious fix that adds a missing function argument in ACPI
code introduced recently (Kees Cook)"
* tag 'pm+acpi-4.4-final' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / property: avoid leaking format string into kobject name
Linus Torvalds [Fri, 8 Jan 2016 23:21:48 +0000 (15:21 -0800)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
"A handful of x86 fixes:
- a syscall ABI fix, fixing an Android breakage
- a Xen PV guest fix relating to the RTC device, causing a
non-working console
- a Xen guest syscall stack frame fix
- an MCE hotplug CPU crash fix"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/numachip: Fix NumaConnect2 MMCFG PCI access
x86/entry: Restore traditional SYSENTER calling convention
x86/entry: Fix some comments
x86/paravirt: Prevent rtc_cmos platform device init on PV guests
x86/xen: Avoid fast syscall path for Xen PV guests
x86/mce: Ensure offline CPUs don't participate in rendezvous process
Linus Torvalds [Fri, 8 Jan 2016 21:57:13 +0000 (13:57 -0800)]
Merge branch 'sched-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar:
"Misc scheduler fixes"
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/core: Reset task's lockless wake-queues on fork()
sched/core: Fix unserialized r-m-w scribbling stuff
sched/core: Check tgid in is_global_init()
sched/fair: Fix multiplication overflow on 32-bit systems
Linus Torvalds [Fri, 8 Jan 2016 21:52:59 +0000 (13:52 -0800)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar:
"Two core subsystem fixes, plus a handful of tooling fixes"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf: Fix race in swevent hash
perf: Fix race in perf_event_exec()
perf list: Robustify event printing routine
perf list: Add support for PERF_COUNT_SW_BPF_OUT
perf hists browser: Fix segfault if use symbol filter in cmdline
perf hists browser: Reset selection when refresh
perf hists browser: Add NULL pointer check to prevent crash
perf buildid-list: Fix return value of perf buildid-list -k
perf buildid-list: Show running kernel build id fix
Linus Torvalds [Fri, 8 Jan 2016 21:46:59 +0000 (13:46 -0800)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip
Pull irq fix from Ingo Molnar:
"Fixes a core IRQ subsystem deadlock"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq: Prevent chip buslock deadlock
Linus Torvalds [Fri, 8 Jan 2016 21:39:09 +0000 (13:39 -0800)]
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block revert from Jens Axboe:
"The previous pull request had a split fix for NVMe, however there are
corner cases where that ends up blowing up.
So let's revert it for 4.4. The regression isn't introduced in this
cycle, and it's "just" a performance regression, not a
stability/integrity issue"
* 'for-linus' of git://git.kernel.dk/linux-block:
Revert "block: Split bios on chunk boundaries"
Linus Torvalds [Fri, 8 Jan 2016 20:23:00 +0000 (12:23 -0800)]
Merge tag 'dmaengine-fix-4.4' of git://git.infradead.org/users/vkoul/slave-dma
Pull dmaengine fixes from Vinod Koul:
"Late fixes for 4.4 are three fixes for drivers which include a revert
of mic-x100 fix which is causing regression, xgene fix for double IRQ
and async_tx fix to use GFP_NOWAIT"
* tag 'dmaengine-fix-4.4' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: xgene-dma: Fix double IRQ issue by setting IRQ_DISABLE_UNLAZY flag
async_tx: use GFP_NOWAIT rather than GFP_IO
dmaengine: Revert "dmaengine: mic_x100: add missing spin_unlock"
Linus Torvalds [Fri, 8 Jan 2016 20:18:45 +0000 (12:18 -0800)]
Merge branch 'dmi-for-linus' of git://git./linux/kernel/git/jdelvare/staging
Pull dmi fix from Jean Delvare.
* 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6
Linus Torvalds [Fri, 8 Jan 2016 19:52:18 +0000 (11:52 -0800)]
Merge tag 'sound-4.4' of git://git./linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A slightly higher volume than a new year's wish, but not too
worrisome: a large LOC is only for HD-audio device-specific quirks, so
fairly safe to apply. The rest ASoC fixes are all trivial and small;
a simple replacement of mutex call with nested lock version, a few
Arizona and Realtek codec fixes, and a regression fix for Skylake
firmware handling"
* tag 'sound-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ASoC: Intel: Skylake: Fix the memory leak
ASoC: Intel: Skylake: Revert previous broken fix memory leak fix
ASoC: Use nested lock for snd_soc_dapm_mutex_lock
ASoC: rt5645: add sys clk detection
ALSA: hda - Add keycode map for alc input device
ALSA: hda - Add mic mute hotkey quirk for Lenovo ThinkCentre AIO
ASoC: arizona: Fix bclk for sample rates that are multiple of 4kHz
Arnd Bergmann [Fri, 8 Jan 2016 16:46:45 +0000 (17:46 +0100)]
Merge tag 'omap-for-v4.4/onenand-corruption' of git://git./linux/kernel/git/tmlind/linux-omap into fixes
Pull "urgent onenand file system corruption fix for n900" from Tony Lindgren:
Last minute urgent pull request to prevent file system corruption
on Nokia N900.
Looks like we have a GPMC bus timing bug that has gone unnoticed
because of bootloader configured registers until few days ago. We
are not detecting the onenand clock rate properly unless we have
CONFIG_OMAP_GPMC_DEBUG set and this causes onenand corruption
that can be easily be reproduced.
There seems to be also an additional bug still lurking around for
onenand corruption. But that is still being investigated and
it does not seem to be GPMC timings related.
Meanwhile, it would be good to get this fix into v4.4 to prevent
wrong timings from corrupting onenand.
* tag 'omap-for-v4.4/onenand-corruption' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP2+: Fix onenand rate detection to avoid filesystem corruption
Jens Axboe [Fri, 8 Jan 2016 16:00:29 +0000 (09:00 -0700)]
Revert "block: Split bios on chunk boundaries"
This reverts commit
d3805611130af9b911e908af9f67a3f64f4f0914.
If we end up splitting on the first segment, we don't adjust
the sector count. That results in hitting a BUG() with attempting
to split 0 sectors.
As this is just a performance issue and not a regression since
4.3 release, let's just rever this change. That gives us more
time to test a real fix for 4.5, which would be marked for
stable anyway.
Richard Cochran [Fri, 8 Jan 2016 15:58:31 +0000 (09:58 -0600)]
PCI: dra7xx: Mark driver as broken
Mark the dra7xx PCI host driver as broken. This driver was first merged in
v3.17 and has never worked. Although the driver compiles just fine, it is
missing an essential device reset. If the driver is included, the kernel
locks up hard shortly after booting, before any console output appears.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Andrea Arcangeli [Fri, 8 Jan 2016 08:00:54 +0000 (09:00 +0100)]
firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6
The dmi_ver wasn't updated correctly before the dmi_decode method run
to save the uuid.
That resulted in "dmidecode -s system-uuid" and
/sys/class/dmi/id/product_uuid disagreeing. The latter was buggy and
this fixes it.
Reported-by: Federico Simoncelli <fsimonce@redhat.com>
Fixes: 9f9c9cbb6057 ("drivers/firmware/dmi_scan.c: fetch dmi version from SMBIOS if it exists")
Fixes: 79bae42d51a5 ("dmi_scan: refactor dmi_scan_machine(), {smbios,dmi}_present()")
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Kees Cook [Thu, 7 Jan 2016 19:24:29 +0000 (11:24 -0800)]
ACPI / property: avoid leaking format string into kobject name
The dn->name is expected to be used as a literal, so add the missing
"%s".
Fixes: 263b4c1a64bc (ACPI / property: Expose data-only subnodes via sysfs)
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linus Torvalds [Thu, 7 Jan 2016 21:06:35 +0000 (13:06 -0800)]
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Pull drm nouveau fix from Dave Airlie:
"Still not back to work, but I decided to forward this fix"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/nouveau/gr/nv40: fix oops in interrupt handler
Linus Torvalds [Thu, 7 Jan 2016 20:56:23 +0000 (12:56 -0800)]
Merge tag 'iommu-fixes-v4.4-rc8' of git://git./linux/kernel/git/joro/iommu
Pull IOMMU fixes from Joerg Roedel:
- Two build issues, one in the ipmmu-vmsa driver and one for the new
generic dma-api implemention used on arm64
- A performance fix for said dma-api implemention
- An issue caused by a wrong offset in map_sg in the same code as above
* tag 'iommu-fixes-v4.4-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
iommu/dma: Use correct offset in map_sg
iommu/ipmmu-vmsa: Don't truncate ttbr if LPAE is not enabled
iommu/dma: Avoid unlikely high-order allocations
iommu/dma: Add some missing #includes
Linus Torvalds [Thu, 7 Jan 2016 20:42:22 +0000 (12:42 -0800)]
Merge tag 'trace-v4.4-rc4-4' of git://git./linux/kernel/git/rostedt/linux-trace
Pull ftrace fix from Steven Rostedt:
"PeiyangX Qiu reported that if a module fails to load between calling
ftrace_module_init() and do_init_module() that the allocations made in
ftrace_module_init() will not be freed, resulting in a memory leak.
The solution is to call ftrace_release_mod() on the failing module in
the fail path befor do_init_module() is called. This will remove any
allocations made for that module, and nothing if ftrace_module_init()
wasn't called yet for that module.
Note, once do_init_module() is called, the MODULE_GOING notifiers are
called for the failed module, which calls into the ftrace code to do
the proper clean up (basically calling ftrace_release_mod())"
* tag 'trace-v4.4-rc4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
ftrace/module: Call clean up function when module init fails early
Steven Rostedt (Red Hat) [Wed, 6 Jan 2016 01:32:47 +0000 (20:32 -0500)]
ftrace/module: Call clean up function when module init fails early
If the module init code fails after calling ftrace_module_init() and before
calling do_init_module(), we can suffer from a memory leak. This is because
ftrace_module_init() allocates pages to store the locations that ftrace
hooks are placed in the module text. If do_init_module() fails, it still
calls the MODULE_GOING notifiers which will tell ftrace to do a clean up of
the pages it allocated for the module. But if load_module() fails before
then, the pages allocated by ftrace_module_init() will never be freed.
Call ftrace_release_mod() on the module if load_module() fails before
getting to do_init_module().
Link: http://lkml.kernel.org/r/567CEA31.1070507@intel.com
Reported-by: "Qiu, PeiyangX" <peiyangx.qiu@intel.com>
Fixes: a949ae560a511 "ftrace/module: Hardcode ftrace_module_init() call into load_module()"
Cc: stable@vger.kernel.org # v2.6.38+
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Roman Volkov [Fri, 1 Jan 2016 13:38:11 +0000 (16:38 +0300)]
dts: vt8500: Add SDHC node to DTS file for WM8650
Since WM8650 has the same 'WMT' SDHC controller as WM8505, and the driver
is already in the kernel, this node enables the controller support for
WM8650
Signed-off-by: Roman Volkov <rvolkov@v1ros.org>
Reviewed-by: Alexey Charkov <alchark@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Timo Sigurdsson [Fri, 1 Jan 2016 13:38:22 +0000 (14:38 +0100)]
ARM: Fix broken USB support in multi_v7_defconfig for sunxi devices
Commit
69fb4dcada77 ("power: Add an axp20x-usb-power driver") introduced a
new driver for the USB power supply used on various Allwinner based SBCs.
However, the driver was not added to multi_v7_defconfig which breaks USB
support for some boards (e.g. LeMaker BananaPi) as the kernel will now
turn off the USB power supply during boot by default if the driver isn't
present. (This was not the case in linux 4.3 or lower where the USB power
was always left on.)
Hence, add the driver to multi_v7_defconfig in order to keep USB support
working on those boards that require it.
Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
Tested-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Paolo Bonzini [Thu, 7 Jan 2016 12:50:38 +0000 (13:50 +0100)]
kvm: x86: only channel 0 of the i8254 is linked to the HPET
While setting the KVM PIT counters in 'kvm_pit_load_count', if
'hpet_legacy_start' is set, the function disables the timer on
channel[0], instead of the respective index 'channel'. This is
because channels 1-3 are not linked to the HPET. Fix the caller
to only activate the special HPET processing for channel 0.
Reported-by: P J P <pjp@fedoraproject.org>
Fixes: 0185604c2d82c560dab2f2933a18f797e74ab5a8
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Robin Murphy [Mon, 4 Jan 2016 16:19:42 +0000 (16:19 +0000)]
iommu/dma: Use correct offset in map_sg
When mapping a non-page-aligned scatterlist entry, we copy the original
offset to the output DMA address before aligning it to hand off to
iommu_map_sg(), then later adding the IOVA page address portion to get
the final mapped address. However, when the IOVA page size is smaller
than the CPU page size, it is the offset within the IOVA page we want,
not that within the CPU page, which can easily be larger than an IOVA
page and thus result in an incorrect final address.
Fix the bug by taking only the IOVA-aligned part of the offset as the
basis of the DMA address, not the whole thing.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Dave Airlie [Thu, 7 Jan 2016 07:18:45 +0000 (17:18 +1000)]
Merge branch 'linux-4.4' of git://github.com/skeggsb/linux into drm-fixes
single nv40 oops fix.
* 'linux-4.4' of git://github.com/skeggsb/linux:
drm/nouveau/gr/nv40: fix oops in interrupt handler
Rameshwar Prasad Sahu [Wed, 23 Dec 2015 12:58:15 +0000 (18:28 +0530)]
dmaengine: xgene-dma: Fix double IRQ issue by setting IRQ_DISABLE_UNLAZY flag
For interrupt controller that doesn't support irq_disable and hardware
with level interrupt, an extra interrupt can be pending. This patch fixes
the issue by setting IRQ_DISABLE_UNLAZY flag for the interrupt line.
Reference: http://git.kernel.org/tip/
e9849777d0e27cdd2902805be51da73e7c79578c
Signed-off-by: Rameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
NeilBrown [Thu, 7 Jan 2016 00:02:34 +0000 (11:02 +1100)]
async_tx: use GFP_NOWAIT rather than GFP_IO
These async_XX functions are called from md/raid5 in an atomic
section, between get_cpu() and put_cpu(), so they must not sleep.
So use GFP_NOWAIT rather than GFP_IO.
Dan Williams writes: Longer term async_tx needs to be merged into md
directly as we can allocate this unmap data statically per-stripe
rather than per request.
Fixed:
7476bd79fc01 ("async_pq: convert to dmaengine_unmap_data")
Cc: stable@vger.kernel.org (v3.13+)
Reported-and-tested-by: Stanislav Samsonov <slava@annapurnalabs.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Linus Walleij [Tue, 5 Jan 2016 08:59:30 +0000 (09:59 +0100)]
ARM: versatile: fix MMC/SD interrupt assignment
Commit
0976c946a610d06e907335b7a3afa6db046f8e1b
"arm/versatile: Fix versatile irq specifications"
has an off-by-one error on the Versatile AB that has
been regressing the Versatile AB hardware for some time.
However it seems like the interrupt assignments have
never been correct and I have now adjusted them according
to the specification. The masks for the valid interrupts
made it impossible to assign the right SIC interrupt
for the MMCI, so I went in and fixed these to correspond
to the specifications, and added references if anyone
wants to double-check.
Due to the Versatile PB including the Versatile AB
as a base DTS file, we need to override and correct
some values to correspond to the actual changes in the
hardware.
For the Versatile PB I don't think the IRQ line
assignment for MMCI has ever been correct for either of
the two MMCI blocks. It would be nice if someone with the
physical PB board could test this.
Patch tested on the Versatile AB, QEMU for Versatile AB
and QEMU for Versatile PB.
Cc: Rob Herring <robh@kernel.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: stable@vger.kernel.org
Fixes: 0976c946a610 ("arm/versatile: Fix versatile irq specifications")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Linus Walleij [Mon, 4 Jan 2016 01:18:28 +0000 (02:18 +0100)]
ARM: nomadik: set latencies to 8 cycles
The Nomadik has sporadic crashes because of these latencies, setting
them to max makes the platform work nicely, so use this values for
now.
These latencies were set to 2 since the Nomadik platform was merged,
but I suspect they never took effect until the right size and
associativity for the cache was specified in the device tree and
that is why the crash comes now.
Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Linus Torvalds [Thu, 7 Jan 2016 04:32:08 +0000 (20:32 -0800)]
Merge tag 'for-linus-
20160106' of git://git.infradead.org/linux-mtd
Pull MTD fixes from Brian Norris:
"Three last MTD fixes for v4.4. These are all fixes for regressions
and bugs reported mid cycle. Unfortunately, some of them took a bit
long to get proper testing and feedback.
- Assign the default MTD name earlier in the registration process, so
partition parsers (like cmdlinepart) see the right name. Without
this, some systems may come up with unpartitioned flash. This was
a v4.4-rc1 regression.
- Revert some new Winbond SPI NOR flash unlocking/locking support;
new code in v4.4 caused regressions on some Spansion flash.
- Fix mis-typed parameter ordering in SPI NOR unlock function; this
bug was introduced in v4.4-rc1"
* tag 'for-linus-
20160106' of git://git.infradead.org/linux-mtd:
mtd: spi-nor: fix stm_is_locked_sr() parameters
mtd: spi-nor: fix Spansion regressions (aliased with Winbond)
mtd: fix cmdlinepart parser, early naming for auto-filled MTD
Linus Torvalds [Thu, 7 Jan 2016 00:15:03 +0000 (16:15 -0800)]
Merge git://git./linux/kernel/git/davem/net
Pull networking fixes from David Miller:
"As usual, there are a couple straggler bug fixes:
1) qlcnic_alloc_mbx_args() error returns are not checked in qlcnic
driver. Fix from Insu Yun.
2) SKB refcounting bug in connector, from Florian Westphal.
3) vrf_get_saddr() has to propagate fib_lookup() errors to it's
callers, from David Ahern.
4) Fix AF_UNIX splice/bind deadlock, from Rainer Weikusat.
5) qdisc_rcu_free() fails to free the per-cpu qstats. Fix from John
Fastabend.
6) vmxnet3 driver passes wrong page to dma_map_page(), fix from
Shrikrishna Khare.
7) Don't allow zero cwnd in tcp_cwnd_reduction(), from Yuchung Cheng"
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
tcp: fix zero cwnd in tcp_cwnd_reduction
Driver: Vmxnet3: Fix regression caused by
5738a09
net: qmi_wwan: Add WeTelecom-WPD600N
mkiss: fix scribble on freed memory
net: possible use after free in dst_release
net: sched: fix missing free per cpu on qstats
ARM: net: bpf: fix zero right shift
6pack: fix free memory scribbles
net: filter: make JITs zero A for SKF_AD_ALU_XOR_X
bridge: Only call /sbin/bridge-stp for the initial network namespace
af_unix: Fix splice-bind deadlock
net: Propagate lookup failure in l3mdev_get_saddr to caller
r8152: add reset_resume function
connector: bump skb->users before callback invocation
cxgb4: correctly handling failed allocation
qlcnic: correctly handle qlcnic_alloc_mbx_args
Yuchung Cheng [Wed, 6 Jan 2016 20:42:38 +0000 (12:42 -0800)]
tcp: fix zero cwnd in tcp_cwnd_reduction
Patch
3759824da87b ("tcp: PRR uses CRB mode by default and SS mode
conditionally") introduced a bug that cwnd may become 0 when both
inflight and sndcnt are 0 (cwnd = inflight + sndcnt). This may lead
to a div-by-zero if the connection starts another cwnd reduction
phase by setting tp->prior_cwnd to the current cwnd (0) in
tcp_init_cwnd_reduction().
To prevent this we skip PRR operation when nothing is acked or
sacked. Then cwnd must be positive in all cases as long as ssthresh
is positive:
1) The proportional reduction mode
inflight > ssthresh > 0
2) The reduction bound mode
a) inflight == ssthresh > 0
b) inflight < ssthresh
sndcnt > 0 since newly_acked_sacked > 0 and inflight < ssthresh
Therefore in all cases inflight and sndcnt can not both be 0.
We check invalid tp->prior_cwnd to avoid potential div0 bugs.
In reality this bug is triggered only with a sequence of less common
events. For example, the connection is terminating an ECN-triggered
cwnd reduction with an inflight 0, then it receives reordered/old
ACKs or DSACKs from prior transmission (which acks nothing). Or the
connection is in fast recovery stage that marks everything lost,
but fails to retransmit due to local issues, then receives data
packets from other end which acks nothing.
Fixes: 3759824da87b ("tcp: PRR uses CRB mode by default and SS mode conditionally")
Reported-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Shrikrishna Khare [Wed, 6 Jan 2016 18:44:27 +0000 (10:44 -0800)]
Driver: Vmxnet3: Fix regression caused by
5738a09
Reported-by: Bingkuo Liu <bingkuol@vmware.com>
Signed-off-by: Shrikrishna Khare <skhare@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Kristian Evensen [Wed, 6 Jan 2016 13:15:50 +0000 (14:15 +0100)]
net: qmi_wwan: Add WeTelecom-WPD600N
The WeTelecom-WPD600N is an LTE module that, in addition to supporting most
"normal" bands, also supports LTE over 450MHz. Manual testing showed that
only interface number three replies to QMI messages.
Cc: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Alan [Wed, 6 Jan 2016 14:55:02 +0000 (14:55 +0000)]
mkiss: fix scribble on freed memory
commit
d79f16c046086f4fe0d42184a458e187464eb83e fixed a user triggerable
scribble on free memory but added a new one which allows the user to
scribble even more and user controlled data into freed space.
As with 6pack we need to halt the queue before we free the buffers, because
the transmit logic is not protected by the semaphore.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Francesco Ruggeri [Wed, 6 Jan 2016 08:18:48 +0000 (00:18 -0800)]
net: possible use after free in dst_release
dst_release should not access dst->flags after decrementing
__refcnt to 0. The dst_entry may be in dst_busy_list and
dst_gc_task may dst_destroy it before dst_release gets a chance
to access dst->flags.
Fixes: d69bbf88c8d0 ("net: fix a race in dst_release()")
Fixes: 27b75c95f10d ("net: avoid RCU for NOCACHE dst")
Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Takashi Iwai [Wed, 6 Jan 2016 19:53:28 +0000 (20:53 +0100)]
Merge tag 'asoc-fix-v4.4-rc8' of git://git./linux/kernel/git/broonie/sound into for-linus
ASoC: Last minute fixes for v4.4
A few final fixes for v4.4, the main one being the two patches to the
new Sky Lake drivers which fix a previous incorrect fix that went in
during an earlier -rc.
Tony Lindgren [Tue, 5 Jan 2016 20:04:20 +0000 (12:04 -0800)]
ARM: OMAP2+: Fix onenand rate detection to avoid filesystem corruption
Commit
63aa945b1013 ("memory: omap-gpmc: Add Kconfig option for debug")
unified the GPMC debug for the SoCs with GPMC. The commit also left out
the option for HWMOD_INIT_NO_RESET as we now require proper timings for
GPMC to be able to remap GPMC devices out of address 0.
Unfortunately on Nokia N900, onenand now only partially works with the
device tree provided timings. It works enough to get detected but the
clock rate supported by the onenand chip gets misdetected. This in turn
causes the GPMC timings to be miscalculated and this leads into file
system corruption on N900.
Looks like onenand needs CS_CONFIG1 bit 27 WRITETYPE set for for sync
write. This is needed also for async timings when we write to onenand
with omap2_onenand_set_async_mode(). Without sync write bit set, the
async read for the onenand ONENAND_REG_VERSION_ID will return 0xfff.
Let's exit with an error if onenand rate is not detected. And let's
remove the extra call to omap2_onenand_set_async_mode() as we only need
to do this once at the end of omap2_onenand_setup_async().
Fixes: 63aa945b1013 ("memory: omap-gpmc: Add Kconfig option for debug")
Cc: stable@vger.kernel.org # v4.2+
Reported-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Tested-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Sebastian Andrzej Siewior [Mon, 21 Dec 2015 17:17:10 +0000 (18:17 +0100)]
sched/core: Reset task's lockless wake-queues on fork()
In the following commit:
7675104990ed ("sched: Implement lockless wake-queues")
we gained lockless wake-queues.
The -RT kernel managed to lockup itself with those. There could be multiple
attempts for task X to enqueue it for a wakeup _even_ if task X is already
running.
The reason is that task X could be runnable but not yet on CPU. The the
task performing the wakeup did not leave the CPU it could performe
multiple wakeups.
With the proper timming task X could be running and enqueued for a
wakeup. If this happens while X is performing a fork() then its its
child will have a !NULL `wake_q` member copied.
This is not a problem as long as the child task does not participate in
lockless wakeups :)
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 7675104990ed ("sched: Implement lockless wake-queues")
Link: http://lkml.kernel.org/r/20151221171710.GA5499@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Peter Zijlstra [Wed, 25 Nov 2015 15:02:07 +0000 (16:02 +0100)]
sched/core: Fix unserialized r-m-w scribbling stuff
Some of the sched bitfieds (notably sched_reset_on_fork) can be set
on other than current, this can cause the r-m-w to race with other
updates.
Since all the sched bits are serialized by scheduler locks, pull them
in a separate word.
Reported-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akpm@linux-foundation.org
Cc: hannes@cmpxchg.org
Cc: mhocko@kernel.org
Cc: vdavydov@parallels.com
Link: http://lkml.kernel.org/r/20151125150207.GM11639@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Sergey Senozhatsky [Fri, 1 Jan 2016 14:03:01 +0000 (23:03 +0900)]
sched/core: Check tgid in is_global_init()
Our global init task can have sub-threads, so ->pid check is not reliable
enough for is_global_init(), we need to check tgid instead. This has been
spotted by Oleg and a fix was proposed by Richard a long time ago (see the
link below).
Oleg wrote:
: Because is_global_init() is only true for the main thread of /sbin/init.
:
: Just look at oom_unkillable_task(). It tries to not kill init. But, say,
: select_bad_process() can happily find a sub-thread of is_global_init()
: and still kill it.
I recently hit the problem in question; re-sending the patch (to the
best of my knowledge it has never been submitted) with updated function
comment. Credit goes to Oleg and Richard.
Suggested-by: Richard Guy Briggs <rgb@redhat.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric W . Biederman <ebiederm@xmission.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Serge E . Hallyn <serge.hallyn@ubuntu.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://www.redhat.com/archives/linux-audit/2013-December/msg00086.html
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Andrey Ryabinin [Mon, 14 Dec 2015 12:47:23 +0000 (15:47 +0300)]
sched/fair: Fix multiplication overflow on 32-bit systems
Make 'r' 64-bit type to avoid overflow in 'r * LOAD_AVG_MAX'
on 32-bit systems:
UBSAN: Undefined behaviour in kernel/sched/fair.c:2785:18
signed integer overflow:
87950 * 47742 cannot be represented in type 'int'
The most likely effect of this bug are bad load average numbers
resulting in weird scheduling. It's also likely that this can
persist for a longer time - until the system goes idle for
a long time so that all load avg numbers get reset.
[ This is the CFS load average metric, not the procfs output, which
is separate. ]
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 9d89c257dfb9 ("sched/fair: Rewrite runnable load and utilization average tracking")
Link: http://lkml.kernel.org/r/1450097243-30137-1-git-send-email-aryabinin@virtuozzo.com
[ Improved the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Peter Zijlstra [Tue, 15 Dec 2015 12:49:05 +0000 (13:49 +0100)]
perf: Fix race in swevent hash
There's a race on CPU unplug where we free the swevent hash array
while it can still have events on. This will result in a
use-after-free which is BAD.
Simply do not free the hash array on unplug. This leaves the thing
around and no use-after-free takes place.
When the last swevent dies, we do a for_each_possible_cpu() iteration
anyway to clean these up, at which time we'll free it, so no leakage
will occur.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Peter Zijlstra [Thu, 10 Dec 2015 19:57:40 +0000 (20:57 +0100)]
perf: Fix race in perf_event_exec()
I managed to tickle this warning:
[ 2338.884942] ------------[ cut here ]------------
[ 2338.890112] WARNING: CPU: 13 PID: 35162 at ../kernel/events/core.c:2702 task_ctx_sched_out+0x6b/0x80()
[ 2338.900504] Modules linked in:
[ 2338.903933] CPU: 13 PID: 35162 Comm: bash Not tainted 4.4.0-rc4-dirty #244
[ 2338.911610] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.
122320131210 12/23/2013
[ 2338.923071]
ffffffff81f1468e ffff8807c6457cb8 ffffffff815c680c 0000000000000000
[ 2338.931382]
ffff8807c6457cf0 ffffffff810c8a56 ffffe8ffff8c1bd0 ffff8808132ed400
[ 2338.939678]
0000000000000286 ffff880813170380 ffff8808132ed400 ffff8807c6457d00
[ 2338.947987] Call Trace:
[ 2338.950726] [<
ffffffff815c680c>] dump_stack+0x4e/0x82
[ 2338.956474] [<
ffffffff810c8a56>] warn_slowpath_common+0x86/0xc0
[ 2338.963195] [<
ffffffff810c8b4a>] warn_slowpath_null+0x1a/0x20
[ 2338.969720] [<
ffffffff811a49cb>] task_ctx_sched_out+0x6b/0x80
[ 2338.976244] [<
ffffffff811a62d2>] perf_event_exec+0xe2/0x180
[ 2338.982575] [<
ffffffff8121fb6f>] setup_new_exec+0x6f/0x1b0
[ 2338.988810] [<
ffffffff8126de83>] load_elf_binary+0x393/0x1660
[ 2338.995339] [<
ffffffff811dc772>] ? get_user_pages+0x52/0x60
[ 2339.001669] [<
ffffffff8121e297>] search_binary_handler+0x97/0x200
[ 2339.008581] [<
ffffffff8121f8b3>] do_execveat_common.isra.33+0x543/0x6e0
[ 2339.016072] [<
ffffffff8121fcea>] SyS_execve+0x3a/0x50
[ 2339.021819] [<
ffffffff819fc165>] stub_execve+0x5/0x5
[ 2339.027469] [<
ffffffff819fbeb2>] ? entry_SYSCALL_64_fastpath+0x12/0x71
[ 2339.034860] ---[ end trace
ee1337c59a0ddeac ]---
Which is a WARN_ON_ONCE() indicating that cpuctx->task_ctx is not
what we expected it to be.
This is because context switches can swap the task_struct::perf_event_ctxp[]
pointer around. Therefore you have to either disable preemption when looking
at current, or hold ctx->lock.
Fix perf_event_enable_on_exec(), it loads current->perf_event_ctxp[]
before disabling interrupts, therefore a preemption in the right place
can swap contexts around and we're using the wrong one.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kostya Serebryany <kcc@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: syzkaller <syzkaller@googlegroups.com>
Link: http://lkml.kernel.org/r/20151210195740.GG6357@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Ashutosh Dixit [Wed, 23 Dec 2015 03:35:23 +0000 (19:35 -0800)]
dmaengine: Revert "dmaengine: mic_x100: add missing spin_unlock"
This reverts commit
e958e079e254 ("dmaengine: mic_x100: add missing
spin_unlock").
The above patch is incorrect. There is nothing wrong with the original
code. The spin_lock is acquired in the "prep" functions and released
in "submit".
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
John Fastabend [Tue, 5 Jan 2016 17:11:36 +0000 (09:11 -0800)]
net: sched: fix missing free per cpu on qstats
When a qdisc is using per cpu stats (currently just the ingress
qdisc) only the bstats are being freed. This also free's the qstats.
Fixes: b0ab6f92752b9f9d8 ("net: sched: enable per cpu qstats")
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rabin Vincent [Tue, 5 Jan 2016 17:34:04 +0000 (18:34 +0100)]
ARM: net: bpf: fix zero right shift
The LSR instruction cannot be used to perform a zero right shift since a
0 as the immediate value (imm5) in the LSR instruction encoding means
that a shift of 32 is perfomed. See DecodeIMMShift() in the ARM ARM.
Make the JIT skip generation of the LSR if a zero-shift is requested.
This was found using american fuzzy lop.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
One Thousand Gnomes [Tue, 5 Jan 2016 11:51:25 +0000 (11:51 +0000)]
6pack: fix free memory scribbles
commit
acf673a3187edf72068ee2f92f4dc47d66baed47 fixed a user triggerable free
memory scribble but in doing so replaced it with a different one that allows
the user to control the data and scribble even more.
sixpack_close is called by the tty layer in tty context. The tty context is
protected by sp_get() and sp_put(). However network layer activity via
sp_xmit() is not protected this way. We must therefore stop the queue
otherwise the user gets to dump a buffer mostly of their choice into freed
kernel pages.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rabin Vincent [Tue, 5 Jan 2016 15:23:07 +0000 (16:23 +0100)]
net: filter: make JITs zero A for SKF_AD_ALU_XOR_X
The SKF_AD_ALU_XOR_X ancillary is not like the other ancillary data
instructions since it XORs A with X while all the others replace A with
some loaded value. All the BPF JITs fail to clear A if this is used as
the first instruction in a filter. This was found using american fuzzy
lop.
Add a helper to determine if A needs to be cleared given the first
instruction in a filter, and use this in the JITs. Except for ARM, the
rest have only been compile-tested.
Fixes: 3480593131e0 ("net: filter: get rid of BPF_S_* enum")
Signed-off-by: Rabin Vincent <rabin@rab.in>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Brian Norris [Tue, 15 Dec 2015 18:48:21 +0000 (10:48 -0800)]
mtd: spi-nor: fix stm_is_locked_sr() parameters
stm_is_locked_sr() takes the status register (SR) value as the last
parameter, not the second.
Reported-by: Bayi Cheng <bayi.cheng@mediatek.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Bayi Cheng <bayi.cheng@mediatek.com>
Brian Norris [Tue, 15 Dec 2015 18:48:20 +0000 (10:48 -0800)]
mtd: spi-nor: fix Spansion regressions (aliased with Winbond)
Spansion and Winbond have occasionally used the same manufacturer ID,
and they don't support the same features. Particularly, writing SR=0
seems to break read access for Spansion's s25fl064k. Unfortunately, we
don't currently have a way to differentiate these Spansion and Winbond
parts, so rather than regressing support for these Spansion flash, let's
drop the new Winbond lock/unlock support for now. We can try to address
Winbond support during the next release cycle.
Original discussion:
http://patchwork.ozlabs.org/patch/549173/
http://patchwork.ozlabs.org/patch/553683/
Fixes: 357ca38d4751 ("mtd: spi-nor: support lock/unlock/is_locked for Winbond")
Fixes: c6fc2171b249 ("mtd: spi-nor: disable protection for Winbond flash at startup")
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reported-by: Felix Fietkau <nbd@openwrt.org>
Cc: Felix Fietkau <nbd@openwrt.org>
Mark Brown [Tue, 5 Jan 2016 23:07:33 +0000 (23:07 +0000)]
Merge remote-tracking branch 'asoc/fix/intel' into asoc-linus
Mark Brown [Tue, 5 Jan 2016 23:07:33 +0000 (23:07 +0000)]
Merge remote-tracking branch 'asoc/fix/rt5645' into asoc-linus
Mark Brown [Tue, 5 Jan 2016 23:07:32 +0000 (23:07 +0000)]
Merge remote-tracking branch 'asoc/fix/dapm' into asoc-linus
Mark Brown [Tue, 5 Jan 2016 23:07:32 +0000 (23:07 +0000)]
Merge remote-tracking branch 'asoc/fix/arizona' into asoc-linus
Hannes Frederic Sowa [Tue, 5 Jan 2016 09:46:00 +0000 (10:46 +0100)]
bridge: Only call /sbin/bridge-stp for the initial network namespace
[I stole this patch from Eric Biederman. He wrote:]
> There is no defined mechanism to pass network namespace information
> into /sbin/bridge-stp therefore don't even try to invoke it except
> for bridge devices in the initial network namespace.
>
> It is possible for unprivileged users to cause /sbin/bridge-stp to be
> invoked for any network device name which if /sbin/bridge-stp does not
> guard against unreasonable arguments or being invoked twice on the
> same network device could cause problems.
[Hannes: changed patch using netns_eq]
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Linus Torvalds [Tue, 5 Jan 2016 21:32:39 +0000 (13:32 -0800)]
Merge tag 'trace-v4.4-rc4-3' of git://git./linux/kernel/git/rostedt/linux-trace
Pull tracing fixes from Steven Rostedt:
"Two more fixes:
1. The recordmcount change had an output that used sprintf()
(incorrectly) when it should have been a fprintf() to stderr.
2. The printk_formats file could crash if someone added a
trace_printk() in the core kernel, and also added one in a module.
This does not affect production kernels. Only kernels where
developers add trace_printk() for debugging can crash"
* tag 'trace-v4.4-rc4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Fix setting of start_index in find_next()
ftrace/scripts: Fix incorrect use of sprintf in recordmcount
Linus Torvalds [Tue, 5 Jan 2016 21:21:19 +0000 (13:21 -0800)]
Merge branch 'stable' of git://git./linux/kernel/git/cmetcalf/linux-tile
Pull tile bugfix from Chris Metcalf:
"This fixes a bug that Sudip's buildbot found for tilepro allmodconfig.
I've tagged it for stable only back to 3.19, which was when most of
the other affected architectures added their support for working
around this issue"
* 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
tile: provide CONFIG_PAGE_SIZE_64KB etc for tilepro
Chris Metcalf [Tue, 22 Dec 2015 17:28:51 +0000 (12:28 -0500)]
tile: provide CONFIG_PAGE_SIZE_64KB etc for tilepro
This allows the build system to know that it can't attempt to
configure the Lustre virtual block device, for example, when tilepro
is using 64KB pages (as it does by default). The tilegx build
already provided those symbols.
Previously we required that the tilepro hypervisor be rebuilt with
a different hardcoded page size in its headers, and then Linux be
rebuilt using the updated hypervisor header. Now we allow each of
the hypervisor and Linux to be built independently. We still check
at boot time to ensure that the page size provided by the hypervisor
matches what Linux expects.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: stable@vger.kernel.org [3.19+]
Vinod Koul [Tue, 5 Jan 2016 11:46:04 +0000 (17:16 +0530)]
ASoC: Intel: Skylake: Fix the memory leak
This provide the fix for firmware memory by freeing the pointer in driver
remove where it is safe to do so
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Vinod Koul [Tue, 5 Jan 2016 11:46:03 +0000 (17:16 +0530)]
ASoC: Intel: Skylake: Revert previous broken fix memory leak fix
This reverts commit
87b5ed8ecb9fe05a696e1c0b53c7a49ea66432c1 ("ASoC: Intel:
Skylake: fix memory leak") as it causes regression on Skylake devices
The SKL drivers can be deferred probe. The topology file based widgets can
have references to topology file so this can't be freed until card is fully
created, so revert this patch for now
[ 66.682767] BUG: unable to handle kernel paging request at
ffffc900001363fc
[ 66.690735] IP: [<
ffffffff806c94dd>] strnlen+0xd/0x40
[ 66.696509] PGD
16e035067 PUD
16e036067 PMD
16e038067 PTE 0
[ 66.702925] Oops: 0000 [#1] PREEMPT SMP
[ 66.768390] CPU: 3 PID: 57 Comm: kworker/u16:3 Tainted: G O 4.4.0-rc7-skl #62
[ 66.778869] Hardware name: Intel Corporation Skylake Client platform
[ 66.793201] Workqueue: deferwq deferred_probe_work_func
[ 66.799173] task:
ffff88008b700f40 ti:
ffff88008b704000 task.ti:
ffff88008b704000
[ 66.807692] RIP: 0010:[<
ffffffff806c94dd>] [<
ffffffff806c94dd>] strnlen+0xd/0x40
[ 66.816243] RSP: 0018:
ffff88008b707878 EFLAGS:
00010286
[ 66.822293] RAX:
ffffffff80e60a82 RBX:
000000000000000e RCX:
fffffffffffffffe
[ 66.830406] RDX:
ffffc900001363fc RSI:
ffffffffffffffff RDI:
ffffc900001363fc
[ 66.838520] RBP:
ffff88008b707878 R08:
000000000000ffff R09:
000000000000ffff
[ 66.846649] R10:
0000000000000001 R11:
ffffffffa01c6368 R12:
ffffc900001363fc
[ 66.854765] R13:
0000000000000000 R14:
00000000ffffffff R15:
0000000000000000
[ 66.862910] FS:
0000000000000000(0000) GS:
ffff88016ecc0000(0000) knlGS:
0000000000000000
[ 66.872150] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[ 66.878696] CR2:
ffffc900001363fc CR3:
0000000002c09000 CR4:
00000000003406e0
[ 66.886820] DR0:
0000000000000000 DR1:
0000000000000000 DR2:
0000000000000000
[ 66.894938] DR3:
0000000000000000 DR6:
00000000fffe0ff0 DR7:
0000000000000400
[ 66.903052] Stack:
[ 66.905346]
ffff88008b7078b0 ffffffff806cb1db 000000000000000e 0000000000000000
[ 66.913854]
ffff88008b707928 ffffffffa00d1050 ffffffffa00d104e ffff88008b707918
[ 66.922353]
ffffffff806ccbd6 ffff88008b707948 0000000000000046 ffff88008b707940
[ 66.930855] Call Trace:
[ 66.933646] [<
ffffffff806cb1db>] string.isra.4+0x3b/0xd0
[ 66.939793] [<
ffffffff806ccbd6>] vsnprintf+0x116/0x540
[ 66.945742] [<
ffffffff806d02f0>] kvasprintf+0x40/0x80
[ 66.951591] [<
ffffffff806d0370>] kasprintf+0x40/0x50
[ 66.957359] [<
ffffffffa00c085f>] dapm_create_or_share_kcontrol+0x1cf/0x300 [snd_soc_core]
[ 66.966771] [<
ffffffff8057dd1e>] ? __kmalloc+0x16e/0x2a0
[ 66.972931] [<
ffffffffa00c0dab>] snd_soc_dapm_new_widgets+0x41b/0x4b0 [snd_soc_core]
[ 66.981857] [<
ffffffffa00be8c0>] ? snd_soc_dapm_add_routes+0xb0/0xd0 [snd_soc_core]
[ 67.007828] [<
ffffffffa00b92ed>] soc_probe_component+0x23d/0x360 [snd_soc_core]
[ 67.016244] [<
ffffffff80b14e69>] ? mutex_unlock+0x9/0x10
[ 67.022405] [<
ffffffffa00ba02f>] snd_soc_instantiate_card+0x47f/0xd10 [snd_soc_core]
[ 67.031329] [<
ffffffff8049eeb2>] ? debug_mutex_init+0x32/0x40
[ 67.037973] [<
ffffffffa00baa92>] snd_soc_register_card+0x1d2/0x2b0 [snd_soc_core]
[ 67.046619] [<
ffffffffa00c8b54>] devm_snd_soc_register_card+0x44/0x80 [snd_soc_core]
[ 67.055539] [<
ffffffffa01c303b>] skylake_audio_probe+0x1b/0x20 [snd_soc_skl_rt286]
[ 67.064292] [<
ffffffff808aa887>] platform_drv_probe+0x37/0x90
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Rainer Weikusat [Sun, 3 Jan 2016 18:56:38 +0000 (18:56 +0000)]
af_unix: Fix splice-bind deadlock
On 2015/11/06, Dmitry Vyukov reported a deadlock involving the splice
system call and AF_UNIX sockets,
http://lists.openwall.net/netdev/2015/11/06/24
The situation was analyzed as
(a while ago) A: socketpair()
B: splice() from a pipe to /mnt/regular_file
does sb_start_write() on /mnt
C: try to freeze /mnt
wait for B to finish with /mnt
A: bind() try to bind our socket to /mnt/new_socket_name
lock our socket, see it not bound yet
decide that it needs to create something in /mnt
try to do sb_start_write() on /mnt, block (it's
waiting for C).
D: splice() from the same pipe to our socket
lock the pipe, see that socket is connected
try to lock the socket, block waiting for A
B: get around to actually feeding a chunk from
pipe to file, try to lock the pipe. Deadlock.
on 2015/11/10 by Al Viro,
http://lists.openwall.net/netdev/2015/11/10/4
The patch fixes this by removing the kern_path_create related code from
unix_mknod and executing it as part of unix_bind prior acquiring the
readlock of the socket in question. This means that A (as used above)
will sb_start_write on /mnt before it acquires the readlock, hence, it
won't indirectly block B which first did a sb_start_write and then
waited for a thread trying to acquire the readlock. Consequently, A
being blocked by C waiting for B won't cause a deadlock anymore
(effectively, both A and B acquire two locks in opposite order in the
situation described above).
Dmitry Vyukov(<dvyukov@google.com>) tested the original patch.
Signed-off-by: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David Ahern [Mon, 4 Jan 2016 17:09:27 +0000 (09:09 -0800)]
net: Propagate lookup failure in l3mdev_get_saddr to caller
Commands run in a vrf context are not failing as expected on a route lookup:
root@kenny:~# ip ro ls table vrf-red
unreachable default
root@kenny:~# ping -I vrf-red -c1 -w1 10.100.1.254
ping: Warning: source address might be selected on device other than vrf-red.
PING 10.100.1.254 (10.100.1.254) from 0.0.0.0 vrf-red: 56(84) bytes of data.
--- 10.100.1.254 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms
Since the vrf table does not have a route for 10.100.1.254 the ping
should have failed. The saddr lookup causes a full VRF table lookup.
Propogating a lookup failure to the user allows the command to fail as
expected:
root@kenny:~# ping -I vrf-red -c1 -w1 10.100.1.254
connect: No route to host
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hayeswang [Mon, 4 Jan 2016 06:38:46 +0000 (14:38 +0800)]
r8152: add reset_resume function
When the reset_resume() is called, the flag of SELECTIVE_SUSPEND should be
cleared and reinitialize the device, whether the SELECTIVE_SUSPEND is set
or not. If reset_resume() is called, it means the power supply is cut or the
device is reset. That is, the device wouldn't be in runtime suspend state and
the reinitialization is necessary.
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Florian Westphal [Thu, 31 Dec 2015 13:26:33 +0000 (14:26 +0100)]
connector: bump skb->users before callback invocation
Dmitry reports memleak with syskaller program.
Problem is that connector bumps skb usecount but might not invoke callback.
So move skb_get to where we invoke the callback.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Insu Yun [Tue, 29 Dec 2015 22:20:11 +0000 (17:20 -0500)]
cxgb4: correctly handling failed allocation
Since t4_alloc_mem can be failed in memory pressure,
if not properly handled, NULL dereference could be happened.
Signed-off-by: Insu Yun <wuninsu@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Insu Yun [Tue, 29 Dec 2015 20:02:18 +0000 (15:02 -0500)]
qlcnic: correctly handle qlcnic_alloc_mbx_args
Since qlcnic_alloc_mbx_args can be failed,
return value should be checked.
Signed-off-by: Insu Yun <wuninsu@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Ben Skeggs [Sun, 3 Jan 2016 23:01:13 +0000 (09:01 +1000)]
drm/nouveau/gr/nv40: fix oops in interrupt handler
fdo#93557
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
Qiu Peiyang [Thu, 31 Dec 2015 05:11:28 +0000 (13:11 +0800)]
tracing: Fix setting of start_index in find_next()
When we do cat /sys/kernel/debug/tracing/printk_formats, we hit kernel
panic at t_show.
general protection fault: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 2957 Comm: sh Tainted: G W O 3.14.55-x86_64
-01062-gd4acdc7 #2
RIP: 0010:[<
ffffffff811375b2>]
[<
ffffffff811375b2>] t_show+0x22/0xe0
RSP: 0000:
ffff88002b4ebe80 EFLAGS:
00010246
RAX:
0000000000000000 RBX:
0000000000000000 RCX:
0000000000000004
RDX:
0000000000000004 RSI:
ffffffff81fd26a6 RDI:
ffff880032f9f7b1
RBP:
ffff88002b4ebe98 R08:
0000000000001000 R09:
000000000000ffec
R10:
0000000000000000 R11:
000000000000000f R12:
ffff880004d9b6c0
R13:
7365725f6d706400 R14:
ffff880004d9b6c0 R15:
ffffffff82020570
FS:
0000000000000000(0000) GS:
ffff88003aa00000(0063) knlGS:
00000000f776bc40
CS: 0010 DS: 002b ES: 002b CR0:
0000000080050033
CR2:
00000000f6c02ff0 CR3:
000000002c2b3000 CR4:
00000000001007f0
Call Trace:
[<
ffffffff811dc076>] seq_read+0x2f6/0x3e0
[<
ffffffff811b749b>] vfs_read+0x9b/0x160
[<
ffffffff811b7f69>] SyS_read+0x49/0xb0
[<
ffffffff81a3a4b9>] ia32_do_call+0x13/0x13
---[ end trace
5bd9eb630614861e ]---
Kernel panic - not syncing: Fatal exception
When the first time find_next calls find_next_mod_format, it should
iterate the trace_bprintk_fmt_list to find the first print format of
the module. However in current code, start_index is smaller than *pos
at first, and code will not iterate the list. Latter container_of will
get the wrong address with former v, which will cause mod_fmt be a
meaningless object and so is the returned mod_fmt->fmt.
This patch will fix it by correcting the start_index. After fixed,
when the first time calls find_next_mod_format, start_index will be
equal to *pos, and code will iterate the trace_bprintk_fmt_list to
get the right module printk format, so is the returned mod_fmt->fmt.
Link: http://lkml.kernel.org/r/5684B900.9000309@intel.com
Cc: stable@vger.kernel.org # 3.12+
Fixes: 102c9323c35a8 "tracing: Add __tracepoint_string() to export string pointers"
Signed-off-by: Qiu Peiyang <peiyangx.qiu@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>