firefly-linux-kernel-4.4.55.git
9 years agovt: Don't check KD_GRAPHICS when binding/unbinding
Daniel Vetter [Mon, 13 Apr 2015 09:16:21 +0000 (11:16 +0200)]
vt: Don't check KD_GRAPHICS when binding/unbinding

This was introduced in

commit 6db4063c5b72b46e9793b0f141a7a3984ac6facf
Author: Antonino A. Daplas <adaplas@gmail.com>
Date:   Mon Jun 26 00:27:12 2006 -0700

    [PATCH] VT binding: Add sysfs control to the VT layer

with the justification

    "In addition, if any of the consoles are in KD_GRAPHICS mode, binding and
    unbinding will not succeed.  KD_GRAPHICS mode usually indicates that the
    underlying console hardware is used for other purposes other than displaying
    text (ie X).  This feature should prevent binding/unbinding from interfering
    with a graphics application using the VT."

I think we should lift this artificial restriction though:
- KD_GRAPHICS doesn't get cleaned up automatically, which means it's
  easy to have terminals stuck in KD_GRAPHICS when hacking around on
  X.
- X doesn't really care, especially with drm where kms already blocks
  fbdev (and hence fbcon) when there's an active compositor.
- This is a root-only interface with a separate .config option and
  it's possible to hang your machine already anyway if you
  unload/reload drivers and don't know what you're doing.

With this patch i915.ko module reloading works again reliably,
something in the recent fedora upgrades broke things.

Cc: Antonino A. Daplas <adaplas@gmail.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agovt: fix console lock vs. kernfs s_active lock order
Imre Deak [Wed, 1 Apr 2015 18:06:16 +0000 (21:06 +0300)]
vt: fix console lock vs. kernfs s_active lock order

Currently there is a lock order problem between the console lock and the
kernfs s_active lock of the console driver's bind sysfs entry. When
writing to the sysfs entry the lock order is first s_active then console
lock, when unregistering the console driver via
do_unregister_con_driver() the order is the opposite. See the below
bugzilla reference for one instance of a lockdep backtrace.

Fix this by unregistering the console driver from a deferred work, where
we can safely drop the console lock while unregistering the device and
corresponding sysfs entries (which in turn acquire s_active). Note that
we have to keep the console driver slot in the registered_con_driver
array reserved for the driver that's being unregistered until it's fully
removed. Otherwise a concurrent call to do_register_con_driver could
try to reuse the same slot and fail when registering the corresponding
device with a minor index that's still in use.

Note that the referenced bug report contains two dmesg logs with two
distinct lockdep reports: [1] is about a locking scenario involving
s_active, console_lock and the fb_notifier list lock, while [2] is
about a locking scenario involving only s_active and console_lock.
In [1] locking fb_notifier triggers the lockdep warning only because
of its dependence on console_lock, otherwise case [1] is the same
s_active<->console_lock dependency problem fixed by this patch.
Before this change we have the following locking scenarios involving
the 3 locks:

a) via do_unregister_framebuffer()->...->do_unregister_con_driver():
   1. console lock 2. fb_notifier lock 3. s_active lock
b) for example via give_up_console()->do_unregister_con_driver():
   1. console lock 2. s_active lock
c) via vt_bind()/vt_unbind():
   1. s_active lock 2. console lock

Since c) is the console bind sysfs entry's write code path we can't
change the locking order there. We can only fix this issue by removing
s_active's dependence on the other two locks in a) and b). We can do
this only in the vt code which owns the corresponding sysfs entry, so
that after the change we have:

a) 1. console lock 2. fb_notifier lock
b) 1. console lock
c) 1. s_active lock 2. console lock
d) in the new con_driver_unregister_callback():
   1. s_active lock

[1] https://bugs.freedesktop.org/attachment.cgi?id=87716
[2] https://bugs.freedesktop.org/attachment.cgi?id=107602

v2:
- get console_lock earlier in con_driver_unregister_callback(), so we
  protect the following console driver field assignments there
- add code coment explaining the reason for deferring the sysfs entry
  removal
- add a third paragraph to the commit message explaining why there are
  two distinct lockdep reports and that this issue is independent of
  fb/fbcon. (Peter Hurley)
v3:
- clarify further the third paragraph
v4:
- rebased on v4 of patch 1/3

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty/hvc: remove celleb-only beat driver
Daniel Axtens [Tue, 14 Apr 2015 05:28:46 +0000 (15:28 +1000)]
tty/hvc: remove celleb-only beat driver

The beat hvc driver is only used by celleb.
celleb has been dropped [1], so drop the drivers.

[1] http://patchwork.ozlabs.org/patch/451730/

CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Jiri Slaby <jslaby@suse.cz>
CC: Valentin Rothberg <valentinrothberg@gmail.com>
CC: mpe@ellerman.id.au
CC: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/nozomi.c: rename CONFIG_MAGIC
Valentin Rothberg [Sun, 12 Apr 2015 16:35:18 +0000 (18:35 +0200)]
drivers/tty/nozomi.c: rename CONFIG_MAGIC

The CONFIG_ prefix is reserved for Kconfig options in Make and CPP
syntax.  CONFIG_MAGIC is a file local CPP identifier so change the
prefix to apply to Kconfig's naming convention.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoTTY: msm_smd_tty: Remove unused driver
Stephen Boyd [Fri, 10 Apr 2015 23:11:05 +0000 (16:11 -0700)]
TTY: msm_smd_tty: Remove unused driver

This code is no longer used now that mach-msm has been removed.
Delete it.

Cc: David Brown <davidb@codeaurora.org>
Cc: Bryan Huntsman <bryanh@codeaurora.org>
Cc: Daniel Walker <dwalker@fifo99.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agofbcon: use the cursor blink interval provided by vt
Scot Doyle [Thu, 26 Mar 2015 13:56:38 +0000 (13:56 +0000)]
fbcon: use the cursor blink interval provided by vt

vt now provides a cursor blink interval via vc_data. Use this
interval instead of the currently hardcoded 200 msecs. Store it in
fbcon_ops to avoid locking the console in cursor_timer_handler().

Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agovt: add cursor blink interval escape sequence
Scot Doyle [Thu, 26 Mar 2015 13:54:39 +0000 (13:54 +0000)]
vt: add cursor blink interval escape sequence

Add an escape sequence to specify the current console's cursor blink
interval. The interval is specified as a number of milliseconds until
the next cursor display state toggle, from 50 to 65535. /proc/loadavg
did not show a difference with a one msec interval, but the lower
bound is set to 50 msecs since slower hardware wasn't tested.

Store the interval in the vc_data structure for later access by fbcon,
initializing the value to fbcon's current hardcoded value of 200 msecs.

Signed-off-by: Scot Doyle <lkml14@scotdoyle.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: Correct error handling on DMA setup
Jon Hunter [Tue, 5 May 2015 14:17:59 +0000 (15:17 +0100)]
serial: tegra: Correct error handling on DMA setup

Function tegra_uart_dma_channel_allocate() does not check that
dma_map_single() mapped the DMA buffer correctly. Add a check for this
and appropriate error handling.

Furthermore, if dmaengine_slave_config() (called by
tegra_uart_dma_channel_allocate()) fails, then memory allocated/mapped
is not freed/unmapped. Therefore, call tegra_uart_dma_channel_free()
instead of just dma_release_channel() if  dmaengine_slave_config() fails.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: Correct shutdown of UARTs
Jon Hunter [Tue, 5 May 2015 14:17:58 +0000 (15:17 +0100)]
serial: tegra: Correct shutdown of UARTs

There are two issues in the shutdown path of the UARTs which are:
1. The function tegra_uart_shutdown() calls tegra_uart_flush_buffer()
   to stop DMA TX transfers. However, tegra_uart_flush_buffer() is
   called after the DMA channels have already been freed and so actually
   does nothing.
2. The function that frees the DMA channels
   (tegra_uart_dma_channel_free()), unmaps the dma buffer before
   freeing the DMA channel and does not ensure the DMA has been
   stopped.

Resolve this by fixing the code in tegra_uart_dma_channel_free() to
ensure the DMA is stopped, free the DMA channel and then unmap the DMA
buffer. Finally, remove the unnecessary call to tegra_uart_flush_buffer().

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: Fix cookie used by TX channel
Jon Hunter [Tue, 5 May 2015 14:17:57 +0000 (15:17 +0100)]
serial: tegra: Fix cookie used by TX channel

The DMA cookie for the RX channel is being used by the TX channel.
Therefore, fix driver to use the correct DMA cookie for the TX channel.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: Use unsigned types for RX and TX byte counts
Jon Hunter [Tue, 5 May 2015 14:17:56 +0000 (15:17 +0100)]
serial: tegra: Use unsigned types for RX and TX byte counts

The function tty_insert_flip_string() takes an argument "size" which is
of type size_t. This is an unsigned type. Update the count,
rx_bytes_requested and tx_bytes_requested in the tegra serial driver to
be unsigned integers so that an unsigned type is passed to
tty_insert_flip_string().

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: handle race condition on uart rx side
Shardar Shariff Md [Tue, 5 May 2015 14:17:55 +0000 (15:17 +0100)]
serial: tegra: handle race condition on uart rx side

The tegra serial driver has two paths through which receive data is
copied up to the tty layer. These are:
1. DMA completion callback
2. UART RX interrupt

A UART RX interrupt occurs for either RX_TIMEOUT (data has been sitting
in the Rx FIFO for more than 4 character times without being read
because there is not enough data to reach the trigger level), End of
Receive Data event (receiver detects that data stops coming in for more
than 4 character times) or a receive error.

In the RX interrupt path, the following happens ...
- All RX DMA transfers are stopped
- Any data in the DMA buffer and RX FIFO are copied up to the tty layer.
- DMA is restarted/primed for the RX path

In the DMA completion callback, the DMA buffer is copied up to the tty
layer but there is no check to see if the RX interrupt could have
occurred between the DMA interrupt firing the the DMA callback running.
Hence, if a RX interrupt was to occur shortly after the DMA completion
interrupt, it is possible that the RX interrupt path has already copied
the DMA buffer before the DMA callback has been called. Therefore, when
the DMA callback is called, if the DMA is already in-progress, then this
indicates that the UART RX interrupt has already occurred and there is
nothing to do in the DMA callback. This race condition can cause
duplicated data to be received.

Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
[jonathanh@nvidia.com: Moved async_tx_ack() call to after check to see
 if DMA has completed because if the DMA is in progress we do not need
 to ACK yet. Changed the print from dev_info to dev_debug. Updated
 changelog to add more commentary on the race condition based upon
 feedback from author.]
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: check the count and read if any from dma
Shardar Shariff Md [Tue, 5 May 2015 14:17:54 +0000 (15:17 +0100)]
serial: tegra: check the count and read if any from dma

It is only necessary to read data from the dma buffer when the count
value is non-zero and hence, tegra_uart_copy_rx_to_tty() so only be
called when this is the case.

Although, this was being tested for in two places, there is a third
place where this was not tested. However, instead of adding another
if-statement prior to calling tegra_uart_copy_rx_to_tty(), move the test
inside the function.

Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
[jonathanh@nvidia.com: Re-worked patch to move the check for the count
 value inside the function tegra_uart_copy_rx_to_tty(). Updated
 changelog with more commentary.]
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: Add delay after enabling FIFO mode
Jon Hunter [Tue, 5 May 2015 14:17:53 +0000 (15:17 +0100)]
serial: tegra: Add delay after enabling FIFO mode

For all tegra devices (up to t210), there is a hardware issue that
requires software to wait for 3 UART clock periods after enabling
the TX fifo, otherwise data could be lost.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: tegra: Correct delay after TX flush
Jon Hunter [Tue, 5 May 2015 14:17:52 +0000 (15:17 +0100)]
serial: tegra: Correct delay after TX flush

For all tegra devices (up to t210), there is a hardware issue that
requires software to wait for 32 UART clock periods for the flush
to propagate otherwise TX data could be post. Add a helper function
to wait for N UART clock periods and update delay following FIFO
flush to be 32 UART clock cycles.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: of_serial: do not set port.type twice
Masahiro Yamada [Fri, 8 May 2015 04:03:13 +0000 (13:03 +0900)]
serial: of_serial: do not set port.type twice

The port.type has already been set by of_platform_serial_setup()
called from a few lines above.
Setting it to the same value is redundant.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: 8250: do not copy port.fifosize member twice
Masahiro Yamada [Thu, 7 May 2015 10:04:46 +0000 (19:04 +0900)]
serial: 8250: do not copy port.fifosize member twice

The port.fifosize member has already been copied at 8 lines above.
Maybe the compiler optimization can clean it away, but just in case.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: xuartps: add __init to earlycon write method
Masahiro Yamada [Thu, 7 May 2015 09:55:40 +0000 (18:55 +0900)]
serial: xuartps: add __init to earlycon write method

Early console functions are only used during the early boot stage.
This change just saves a small amount of memory footprint.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: 8250: Do nothing if nr_uarts=0
Jan Kiszka [Tue, 5 May 2015 06:26:27 +0000 (08:26 +0200)]
serial: 8250: Do nothing if nr_uarts=0

When nr_uarts was set to 0 (via config or 8250_core.nr_uarts), we crash
early on x86 because serial8250_isa_init_ports dereferences base_ops
which remains NULL. In fact, there is nothing to do for all the callers
of serial8250_isa_init_ports if there are no uarts.

Based on suggestions by Peter Hurley.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: samsung: Constify platform_device_id
Krzysztof Kozlowski [Fri, 1 May 2015 15:40:05 +0000 (00:40 +0900)]
serial: samsung: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: samsung: Staticize local symbol
Krzysztof Kozlowski [Fri, 1 May 2015 15:40:04 +0000 (00:40 +0900)]
serial: samsung: Staticize local symbol

Staticize symbols not exported and not used outside of file.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: mxs: Constify platform_device_id
Krzysztof Kozlowski [Fri, 1 May 2015 15:40:03 +0000 (00:40 +0900)]
serial: mxs: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: imx: Constify platform_device_id
Krzysztof Kozlowski [Fri, 1 May 2015 15:40:02 +0000 (00:40 +0900)]
serial: imx: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Remove obsolete comment about overrun detection
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:34 +0000 (18:21 +0200)]
serial: sh-sci: Remove obsolete comment about overrun detection

The code it refers to was removed in commit b545e4f40613be70 ("serial:
sh-sci: Compute overrun_bit without using baud rate algo").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Don't set SCLSR bits in the SCxSR error mask
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:33 +0000 (18:21 +0200)]
serial: sh-sci: Don't set SCLSR bits in the SCxSR error mask

error_mask is the union of all error indicating bits in the SCxSR
register, while overrun_mask may apply to a different register (SCLSR),
depending on the SCI variant.

Hence overrun_mask should only be ORed into error_mask if it applies to
the SCxSR register.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Use the correct register for overrun checks
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:32 +0000 (18:21 +0200)]
serial: sh-sci: Use the correct register for overrun checks

The various SCI implementations use 3 different methods to signal
overrun errors:
  - Bit SCI_ORER in register SCxSR on SCI,
  - Bit SCIFA_ORER in register SCxSR on SCIFA and SCIFB, and SCIF on
    SH7705/SH7720/SH7721,
  - Bit SCLSR_ORER in (optional!) register SCLSR on (H)SCIF.

However:
  1. sci_handle_fifo_overrun()
       a. handles (H)SCIF and SCIFA/SCIFB only,
       b. treats SCIF on SH7705/SH7720/SH7721 incorrectly,
  2. sci_mpxed_interrupt()
       a. treats SCIF on SH7705/SH7720/SH7721 incorrectly,
       b. ignores that not all SCIFs have the SCLSR register, causing
  "Invalid register access" WARN()ings.

To fix the above:
  1. Determine and store the correct register enum during
     initialization,
  2. Replace the duplicated buggy switch statements by using the stored
     register enum,
  3. Add the missing existence check to  sci_mpxed_interrupt().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Replace hardcoded overrun bit values
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:31 +0000 (18:21 +0200)]
serial: sh-sci: Replace hardcoded overrun bit values

Add the missing overrun bit definition for (H)SCIF.
Replace overrun_bit by overrun_mask, so we can use the existing
defines instead of hardcoded values.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Replace hardcoded values in SCxSR_*_CLEAR macros
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:30 +0000 (18:21 +0200)]
serial: sh-sci: Replace hardcoded values in SCxSR_*_CLEAR macros

Add the missing overrun error bit in SCxSR on SCIFA/SCIFB and SCIF on
SH7705/SH7720/SH7721.
Document what the corresponding bit(s) on plain SCIF are used for.
Sort the components of SCIF_DEFAULT_ERROR_MASK by reverse definition
order.

Replace the hardcoded values in the SCxSR_*_CLEAR macros by proper
defines. Use bit masks (negations of sets of bits) to make it more
obvious which bits are being cleared.

Assembler output (on sh) was compared before and after this commit:
  - For the first branch of the big "#if defined(...) || ..." construct,
    the code has changed slightly, as 32-bit bitmasks can be loaded in a
    single instruction, unlike the old large 16-bit constants (the SCxSR
    register is 16 bit, so we don't care about the top 16 bits),
  - For the second branch, the generated code is identical.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Standardize on using the BIT() macro to define register bits
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:29 +0000 (18:21 +0200)]
serial: sh-sci: Standardize on using the BIT() macro to define register bits

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Document remaining FIFO Control Register bits
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:28 +0000 (18:21 +0200)]
serial: sh-sci: Document remaining FIFO Control Register bits

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Add SCIFA/B SCPCR register definitions
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:27 +0000 (18:21 +0200)]
serial: sh-sci: Add SCIFA/B SCPCR register definitions

Add the register definitions for the Serial Port Control and Data
Registers on SCIFA/SCIFB, which are needed for RTS/CTS pin control.

Extracted from patches by Magnus Damm <damm+renesas@opensource.se>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Add (H)SCIF RTS/CTS pin data register bit definitions
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:26 +0000 (18:21 +0200)]
serial: sh-sci: Add (H)SCIF RTS/CTS pin data register bit definitions

Add the missing register bit definitions to set the RTS pin and read the
CTS pin on (H)SCIF.

Extracted from patches by Magnus Damm <damm+renesas@opensource.se>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sh-sci: Move private definitions to private header file
Geert Uytterhoeven [Thu, 30 Apr 2015 16:21:25 +0000 (18:21 +0200)]
serial: sh-sci: Move private definitions to private header file

Move private register definitions and enums from the public
<linux/serial_sci.h> header file to the driver private "sh-sci.h" header
file.

The common Serial Control Register definitions are left in the public
header file, as they're needed to fill in plat_sci_port.scscr on legacy
systems not using DT.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: tty_ldsem.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:18 +0000 (11:22 +0200)]
tty: tty_ldsem.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: tty_buffer.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:17 +0000 (11:22 +0200)]
tty: tty_buffer.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: synclinkmp.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:16 +0000 (11:22 +0200)]
tty: synclinkmp.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: synclink_gt.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:15 +0000 (11:22 +0200)]
tty: synclink_gt.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: synclink.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:14 +0000 (11:22 +0200)]
tty: synclink.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: mpsc.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:13 +0000 (11:22 +0200)]
tty: mpsc.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: ioc4_serial.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:12 +0000 (11:22 +0200)]
tty: ioc4_serial.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Pat Gefre <pfg@sgi.com>
CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: ioc3_serial.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:11 +0000 (11:22 +0200)]
tty: ioc3_serial.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Pat Gefre <pfg@sgi.com>
CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: icom.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:10 +0000 (11:22 +0200)]
tty: icom.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: hvcs.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:09 +0000 (11:22 +0200)]
tty: hvcs.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
CC: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: hvc_console.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:08 +0000 (11:22 +0200)]
tty: hvc_console.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
CC: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: crisv10.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:07 +0000 (11:22 +0200)]
tty: crisv10.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Mikael Starvik <starvik@axis.com>
CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
9 years agotty: consolemap.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:06 +0000 (11:22 +0200)]
tty: consolemap.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
CC: Takashi Iwai <tiwai@suse.de>
CC: Imre Deak <imre.deak@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: amiserial.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:05 +0000 (11:22 +0200)]
tty: amiserial.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: 68328serial.c: move assignment out of if () block
Greg Kroah-Hartman [Thu, 30 Apr 2015 09:22:04 +0000 (11:22 +0200)]
tty: 68328serial.c: move assignment out of if () block

We should not be doing assignments within an if () block
so fix up the code to not do this.

change was created using Coccinelle.

CC: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sirf: use uart_port's fifosize for fifo related operation
Qipan Li [Wed, 29 Apr 2015 06:45:09 +0000 (06:45 +0000)]
serial: sirf: use uart_port's fifosize for fifo related operation

In SiRF platform, there are different fifo size of uart and usp,
with the fifosize configuration changes in different chips, we
can not use port line to decide how to check FIFO full,empty and
level.

There is a direct mapping between FIFO HW register layout with
fifo size, so move to use fifosize as the input to check fifo
status.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sirf: use dynamic method allocate uart structure
Qipan Li [Wed, 29 Apr 2015 06:45:08 +0000 (06:45 +0000)]
serial: sirf: use dynamic method allocate uart structure

In different platform of SiRF SoCs, there is no same uart and usp-uart
numbers, it is not convenient to use hard-coded ports array and port
lines.

here we drop the hard-coded ports table , and drop "cell-index". then
move to use alias id to get line.

for example:
aliases {
serial0 = &uart0;
serial1 = &uart1;
serial2 = &uart2;
serial3 = &uart3;
serial4 = &uart4;
serial5 = &uart5;
serial6 = &uart6;
serial9 = &usp2;
};

at the same, enlarge the max port number according to the chip with the most
UART.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250_mtk: Add earlycon
Eddie Huang [Tue, 28 Apr 2015 13:40:33 +0000 (21:40 +0800)]
tty: serial: 8250_mtk: Add earlycon

Add 8250 MTK UART driver to support earlycon device tree.
Earlycon take effect by
  add "earlycon" in kernel boot argument
  add "linux,sdtout-path" property in device tree file

Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250: export early_serial8250_setup function
Eddie Huang [Tue, 28 Apr 2015 13:40:32 +0000 (21:40 +0800)]
tty: serial: 8250: export early_serial8250_setup function

8250-like uart driver may call early_serial8250_setup to
reuse 8250_early.c character output function.

Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250_mtk: Add support for bus clock
Sascha Hauer [Mon, 27 Apr 2015 06:49:57 +0000 (08:49 +0200)]
tty: serial: 8250_mtk: Add support for bus clock

The mtk 8250 needs two clocks, one for providing the baudrate and
one that needs to be enabled for register accesses. The latter has
not been supported, this patch adds support for it. It is optional
for now since not all SoCs provide a bus clock.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250_mtk: use pm_runtime callbacks for enabling
Sascha Hauer [Mon, 27 Apr 2015 06:49:56 +0000 (08:49 +0200)]
tty: serial: 8250_mtk: use pm_runtime callbacks for enabling

The pm_runtime callbacks already enable and disable the device.
Use them in probe() and remove() instead of duplicating the
code. This allows us to concentrate more code for enabling/disabling
the UART in a single place.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250_mtk: Use devm_clk_get
Sascha Hauer [Mon, 27 Apr 2015 06:49:55 +0000 (08:49 +0200)]
tty: serial: 8250_mtk: Use devm_clk_get

When a struct device * is present clk_get should be used rather
than of_clk_get. Use the devm variant of this function to be able to
drop the clk_put in the error and remove pathes. While at it fix
a wrong error message.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250_mtk: remove unnecessary test
Sascha Hauer [Mon, 27 Apr 2015 06:49:54 +0000 (08:49 +0200)]
tty: serial: 8250_mtk: remove unnecessary test

When the driver has probed successfully the clk pointer is always valid,
so no need to test for it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoARM: meson: serial: convert iounmap to devm_iounmap
Firo Yang [Sun, 26 Apr 2015 10:46:06 +0000 (18:46 +0800)]
ARM: meson: serial: convert iounmap to devm_iounmap

The function meson_uart_release_port() inappropriately try to
iounmap() a resource managed by devm_ioremap_nocache().
The function meson_uart_release_port() maybe called by uart_ioctl()
that means meson_uart_release_port() is not called from within a
probe or remove function, for safety, I convert iounmap() to
devm_iounmap().

Signed-off-by: Firo Yang <firogm@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: serial: 8250: omap: synchronize rx_running
John Ogness [Mon, 27 Apr 2015 11:52:33 +0000 (13:52 +0200)]
tty: serial: 8250: omap: synchronize rx_running

The rx_running flag should show if DMA is currently active. However
there is a window between when the flag is set/cleared and when
the DMA is started/stopped. Because the flag is queried from both
hard and soft irq contexts, the driver can make incorrect
decisions and do things like start a DMA transfer using a buffer
that is already setup to be used for a DMA transfer.

This patch adds a spinlock to synchronize the rx_running flag and
close the above mentioned window.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodmaenegine: edma: allow pause/resume for non-cyclic mode
John Ogness [Mon, 27 Apr 2015 11:52:25 +0000 (13:52 +0200)]
dmaenegine: edma: allow pause/resume for non-cyclic mode

The 8250_omap serial driver relies on dmaengine_pause() actually
pausing the DMA transfer. Before this patch dmaengine_pause() is
a NOP for non-cylic DMA transfers. This allowed the 8250_omap
driver to read DMA buffers while the DMA was still active,
resulting in lost serial data.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoARM: common: edma: clear completion interrupts on stop
John Ogness [Mon, 27 Apr 2015 11:52:15 +0000 (13:52 +0200)]
ARM: common: edma: clear completion interrupts on stop

When stopping a DMA transfer with interrupts disabled it is possible
that the DMA transfer completes before the events are cleared. In
this case the completion interrupt will be pending, causing a
completion callback after the transfer was stopped.

By clearing the completion interrupt for the stopping channel it is
ensured that no completion event will be generated after the stop.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: SERIAL_IFX6X60 should depend on HAS_DMA
Geert Uytterhoeven [Thu, 23 Apr 2015 14:15:41 +0000 (16:15 +0200)]
serial: SERIAL_IFX6X60 should depend on HAS_DMA

If NO_DMA=y:

    drivers/built-in.o: In function `ifx_spi_free_device':
    ifx6x60.c:(.text+0x96d9a): undefined reference to `dma_free_coherent'
    drivers/built-in.o: In function `ifx_spi_spi_probe':
    ifx6x60.c:(.text+0x978a2): undefined reference to `dma_alloc_coherent'

While DMA is optional in this driver, and is used only if
ifx_modem_platform_data.use_dma is set, there are currently no in-tree
users of ifx_modem_platform_data (and thus of this driver), so just make
it depend on HAS_DMA.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: ifx6x60: Remove superfluous casts when calling request_irq()
Geert Uytterhoeven [Thu, 23 Apr 2015 14:15:40 +0000 (16:15 +0200)]
serial: ifx6x60: Remove superfluous casts when calling request_irq()

There's no need to cast the last parameter of {request,free}_irq() to
"void *", as any pointer type is accepted.

Remove the superfluous casts to fix this.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: ifx6x60: Remove dangerous spi_driver casts
Geert Uytterhoeven [Thu, 23 Apr 2015 14:15:39 +0000 (16:15 +0200)]
serial: ifx6x60: Remove dangerous spi_driver casts

Casting spi_driver pointers to "void *" when calling
spi_{,un}register_driver() bypasses all type checking.

Remove the superfluous casts to fix this.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: sirf: move from clk_get to devm_clk_get
Qipan Li [Mon, 20 Apr 2015 08:10:23 +0000 (08:10 +0000)]
serial: sirf: move from clk_get to devm_clk_get

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoRevert "serial: sirf: add a new uart type support"
Qipan Li [Mon, 20 Apr 2015 08:10:22 +0000 (08:10 +0000)]
Revert "serial: sirf: add a new uart type support"

This reverts commit 52bec4ed4e("serial: sirf: add a new uart type
support").
we misunderstood the clock dependency in atlas7. Actually involved
several clocks are in a tree structure. we still only need to take
the leaf clock node for BT uarts.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Barry.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: 8250: remove Kconfig indirection
Valentin Rothberg [Sun, 12 Apr 2015 15:37:24 +0000 (17:37 +0200)]
serial: 8250: remove Kconfig indirection

Remove CONFIG_SERIAL_DETECT_IRQ and CONFIG_SERIAL_MANY_PORTS, and
substitute all references to the proper 8250 Kconfig options.  Now, the
actual Kconfig dependencies are not hidden when reading the code and
static analyzers are less confused.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: core: Fix unused variable warnings from uart_console()
Peter Hurley [Sat, 11 Apr 2015 15:02:36 +0000 (11:02 -0400)]
serial: core: Fix unused variable warnings from uart_console()

If CONFIG_SERIAL_CORE_CONSOLE=n, build warnings are generated by
uart_console() macro expansion:

drivers/tty/serial/of_serial.c: In function â€˜of_serial_suspend_8250’:
drivers/tty/serial/of_serial.c:262:20: warning: unused variable â€˜port’ [-Wunused-variable]
  struct uart_port *port = &port8250->port;
                    ^
drivers/tty/serial/of_serial.c: In function â€˜of_serial_resume_8250’:
drivers/tty/serial/of_serial.c:272:20: warning: unused variable â€˜port’ [-Wunused-variable]
  struct uart_port *port = &port8250->port;

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/mcf.c: fix typo on SERIAL_MCF_CONSOLE
Valentin Rothberg [Sun, 12 Apr 2015 16:18:23 +0000 (18:18 +0200)]
drivers/tty/serial/mcf.c: fix typo on SERIAL_MCF_CONSOLE

Correct reference in C-comment after #endif.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: bfin: ctsrts: enfore Kconfig naming convention
Valentin Rothberg [Sun, 12 Apr 2015 15:54:35 +0000 (17:54 +0200)]
serial: bfin: ctsrts: enfore Kconfig naming convention

The CONFIG_ prefix is reserved for Kconfig options in Make and CPP
syntax; static analysis tools rely on this convention.  This patch
enforces this behavior for SERIAL_BFIN_{HARD_}CTSRTS.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Acked-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/mpc52xx_uart.c: fix typo in C comment
Valentin Rothberg [Sun, 12 Apr 2015 15:14:45 +0000 (17:14 +0200)]
drivers/tty/serial/mpc52xx_uart.c: fix typo in C comment

Fix reference on PPC_MPC52xx in C comment after #endif.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/8250/8250_core.c: remove CONFIG_HUB6
Valentin Rothberg [Sun, 12 Apr 2015 15:03:22 +0000 (17:03 +0200)]
drivers/tty/serial/8250/8250_core.c: remove CONFIG_HUB6

This file local CPP identifier is not referenced anywhere else, so we
can safely remove it.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty/serial: at91: handle IRQ status more safely
Leilei Zhao [Thu, 9 Apr 2015 02:48:15 +0000 (10:48 +0800)]
tty/serial: at91: handle IRQ status more safely

Handle the changed flag of IRQ status in interruption
instead of handling it in tasklet due to the tasklet
may be scheduled more than once in one interruption.
Otherwise, the changed status may be processed more
than once which will lead to unexpected result. And
seriously, kernel will crash.

Signed-off-by: Leilei Zhao <leilei.zhao@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/crisv10.c: rename CPP identifier CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
Valentin Rothberg [Sat, 11 Apr 2015 13:56:03 +0000 (15:56 +0200)]
drivers/tty/serial/crisv10.c: rename CPP identifier CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED

The 'CONFIG_' prefix is reserved for Kconfig options in Make and CPP
syntax only.  Remove this prefix from the self-defined CPP identifier to
apply to this convention and make static analysis tools happy.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/crisv10.c: remove dead #ifdef blocks
Valentin Rothberg [Sat, 11 Apr 2015 13:56:02 +0000 (15:56 +0200)]
drivers/tty/serial/crisv10.c: remove dead #ifdef blocks

ETRAX_SERIAL_PROC_ENTRY is not defined in Kconfig.  The affected #ifdef
block has not been compiled for years, and the embedded macro, PROCSTAT,
ended up as a NOOP.  Hence, remove the block and all calls to PROCSTAT.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/crisv10.c: remove dead #ifdef blocks
Valentin Rothberg [Sat, 11 Apr 2015 13:56:01 +0000 (15:56 +0200)]
drivers/tty/serial/crisv10.c: remove dead #ifdef blocks

ETRAX_RS485_{ON_PORT_G, LTC1387} are not defined in Kconfig.  The
affected #ifdef block have not been compiled for years, so remove them
entirely.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/crisv10.c: remove dead #ifdef block
Valentin Rothberg [Sat, 11 Apr 2015 13:56:00 +0000 (15:56 +0200)]
drivers/tty/serial/crisv10.c: remove dead #ifdef block

ETRAX_EXTERN_PB6CLK_ENABLED is not defined in Kconfig.  The affected
 #ifdef block has not been compiled for years, so remove it entirely.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial: altera: fix typos in #endif comments
Valentin Rothberg [Sat, 11 Apr 2015 10:21:30 +0000 (12:21 +0200)]
drivers/tty/serial: altera: fix typos in #endif comments

Correct reference on CONFIG_SERIAL_ALTERA_{JTAG}UART_CONSOLE in
C-comment after #endif.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Acked-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agodrivers/tty/serial/sh-sci.h: remove dead reference on ARCH_SH7372
Valentin Rothberg [Sat, 11 Apr 2015 10:26:19 +0000 (12:26 +0200)]
drivers/tty/serial/sh-sci.h: remove dead reference on ARCH_SH7372

The Kconfig option ARCH_SH7372 has been removed by commit 59b89af1d555
("ARM: shmobile: sh7372: Remove Legacy C SoC code").  This patch removes
the last reference on this Kconfig option.

Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: kgdb_nmi: Use bool function return values of true/false not 1/0
Joe Perches [Mon, 30 Mar 2015 17:43:23 +0000 (10:43 -0700)]
serial: kgdb_nmi: Use bool function return values of true/false not 1/0

Use the normal return values for bool functions

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: remove buf parameter from tty_name()
Rasmus Villemoes [Tue, 31 Mar 2015 13:55:59 +0000 (15:55 +0200)]
tty: remove buf parameter from tty_name()

tty_name no longer uses the buf parameter, so remove it along with all
the 64 byte stack buffers that used to be passed in.

Mostly generated by the coccinelle script

@depends on patch@
identifier buf;
constant C;
expression tty;
@@
- char buf[C];
  <+...
- tty_name(tty, buf)
+ tty_name(tty)
  ...+>

allmodconfig compiles, so I'm fairly confident the stack buffers
weren't used for other purposes as well.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: return tty->name directly from tty_name
Rasmus Villemoes [Tue, 31 Mar 2015 13:55:58 +0000 (15:55 +0200)]
tty: return tty->name directly from tty_name

All users of tty_name pass the return value (the provided buffer) to
some printf-like function. We can thus avoid the strcpy and, more
importantly, later remove the buf parameter completely, eliminating
the need for some 64 byte stack buffers.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agotty: constify return type of tty_name
Rasmus Villemoes [Tue, 31 Mar 2015 13:55:57 +0000 (15:55 +0200)]
tty: constify return type of tty_name

All users of tty_name pass the result directly to a printf-like
function. This means we can actually let tty_name return the literal
"NULL tty" or tty->name directly, avoiding the strcpy and a lot of
medium-sized stack buffers. In preparation for that, make the return
type const char*.

While at it, we can also constify the tty parameter.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: imx: Remove return value from imx_setup_ufcr()
Fabio Estevam [Fri, 10 Apr 2015 02:22:43 +0000 (23:22 -0300)]
serial: imx: Remove return value from imx_setup_ufcr()

The return value from imx_setup_ufcr() is always 0 and its value is never
checked, so better to remove the return value.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial: imx: protect Soft Reset of port with lock
Jiada Wang [Mon, 13 Apr 2015 09:31:43 +0000 (18:31 +0900)]
serial: imx: protect Soft Reset of port with lock

Previously Soft Reset (clear of SRST bit in UCR2 register)
of UART in startup is not protected by lock, which may have race
with console_write, as console_write may occur at anytime even
when UART port is shutdown.

To avoid this race, protect Soft reset of UART port with spin_lock.

Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoserial/amba-pl011: Refactor and simplify TX FIFO handling
Dave Martin [Mon, 27 Apr 2015 15:49:05 +0000 (16:49 +0100)]
serial/amba-pl011: Refactor and simplify TX FIFO handling

Commit 734745c serial/amba-pl011: Activate TX IRQ passively
adds some complexity and overhead in the form of a softirq
mechanism for transmitting in the absence of interrupts.

This patch simplifies the code flow to reduce the reliance on
subtle behaviour and avoid fragility under future maintenance.

To this end, the TX softirq mechanism is removed and instead
pl011_start_tx() will now simply stuff the FIFO until full
(guaranteeing future TX IRQs), or until there are no more chars
to write (in which case we don't care whether an IRQ happens).

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoRevert "serial/amba-pl011: Leave the TX IRQ alone when the UART is not open"
Dave Martin [Mon, 27 Apr 2015 15:49:04 +0000 (16:49 +0100)]
Revert "serial/amba-pl011: Leave the TX IRQ alone when the UART is not open"

This reverts commit f2ee6dfa0e8597eea8b98d240b0033994e20d215.

Jakub KiciƄski observed that this patch can cause the pl011
driver to hang if if the only process with a pl011 port open is
killed by a signal, pl011_shutdown() can get called with an
arbitrary amount of data still in the FIFO.

Calling _shutdown() with the TX FIFO non-empty is questionable
behaviour and my itself be a bug.

Since the affected patch was speculative anyway, and brings limited
benefit, the simplest course is to remove the assumption that TXIS
will always be left asserted after the port is shut down.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9 years agoLinux 4.1-rc2
Linus Torvalds [Mon, 4 May 2015 02:22:23 +0000 (19:22 -0700)]
Linux 4.1-rc2

9 years agoMerge tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
Linus Torvalds [Mon, 4 May 2015 01:23:53 +0000 (18:23 -0700)]
Merge tag 'for_linus_stable' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 fixes from Ted Ts'o:
 "Some miscellaneous bug fixes and some final on-disk and ABI changes
  for ext4 encryption which provide better security and performance"

* tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix growing of tiny filesystems
  ext4: move check under lock scope to close a race.
  ext4: fix data corruption caused by unwritten and delayed extents
  ext4 crypto: remove duplicated encryption mode definitions
  ext4 crypto: do not select from EXT4_FS_ENCRYPTION
  ext4 crypto: add padding to filenames before encrypting
  ext4 crypto: simplify and speed up filename encryption

9 years agoMerge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Mon, 4 May 2015 01:15:48 +0000 (18:15 -0700)]
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "One intel fix, one rockchip fix, and a bunch of radeon fixes for some
  regressions from audio rework and vm stability"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/i915/chv: Implement WaDisableShadowRegForCpd
  drm/radeon: fix userptr return value checking (v2)
  drm/radeon: check new address before removing old one
  drm/radeon: reset BOs address after clearing it.
  drm/radeon: fix lockup when BOs aren't part of the VM on release
  drm/radeon: add SI DPM quirk for Sapphire R9 270 Dual-X 2G GDDR5
  drm/radeon: adjust pll when audio is not enabled
  drm/radeon: only enable audio streams if the monitor supports it
  drm/radeon: only mark audio as connected if the monitor supports it (v3)
  drm/radeon/audio: don't enable packets until the end
  drm/radeon: drop dce6_dp_enable
  drm/radeon: fix ordering of AVI packet setup
  drm/radeon: Use drm_calloc_ab for CS relocs
  drm/rockchip: fix error check when getting irq
  MAINTAINERS: add entry for Rockchip drm drivers

9 years agoMerge tag 'drm-intel-fixes-2015-04-30' of git://anongit.freedesktop.org/drm-intel...
Dave Airlie [Sun, 3 May 2015 22:56:47 +0000 (08:56 +1000)]
Merge tag 'drm-intel-fixes-2015-04-30' of git://anongit.freedesktop.org/drm-intel into drm-fixes

Just a single intel fix
* tag 'drm-intel-fixes-2015-04-30' of git://anongit.freedesktop.org/drm-intel:
  drm/i915/chv: Implement WaDisableShadowRegForCpd

9 years agoMerge branch 'drm-next0420' of https://github.com/markyzq/kernel-drm-rockchip into...
Dave Airlie [Sun, 3 May 2015 22:56:27 +0000 (08:56 +1000)]
Merge branch 'drm-next0420' of https://github.com/markyzq/kernel-drm-rockchip into drm-fixes

one fix and maintainers update
* 'drm-next0420' of https://github.com/markyzq/kernel-drm-rockchip:
  drm/rockchip: fix error check when getting irq
  MAINTAINERS: add entry for Rockchip drm drivers

9 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sun, 3 May 2015 20:22:32 +0000 (13:22 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "This is three logical fixes (as 5 patches).

  The 3ware class of drivers were causing an oops with multiqueue by
  tearing down the command mappings after completing the command (where
  the variables in the command used to tear down the mapping were
  no-longer valid).  There's also a fix for the qnap iscsi target which
  was choking on us sending it commands that were too long and a fix for
  the reworked aha1542 allocating GFP_KERNEL under a lock"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  3w-9xxx: fix command completion race
  3w-xxxx: fix command completion race
  3w-sas: fix command completion race
  aha1542: Allocate memory before taking a lock
  SCSI: add 1024 max sectors black list flag

9 years agoMerge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
Linus Torvalds [Sun, 3 May 2015 17:49:04 +0000 (10:49 -0700)]
Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma

Pull slave dmaengine fixes from Vinod Koul:
 "Here are the fixes in dmaengine subsystem for rc2:

   - privatecnt fix for slave dma request API by Christopher

   - warn fix for PM ifdef in usb-dmac by Geert

   - fix hardware dependency for xgene by Jean"

* 'next' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: increment privatecnt when using dma_get_any_slave_channel
  dmaengine: xgene: Set hardware dependency
  dmaengine: usb-dmac: Protect PM-only functions to kill warning

9 years agoMerge tag 'powerpc-4.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
Linus Torvalds [Sun, 3 May 2015 17:28:36 +0000 (10:28 -0700)]
Merge tag 'powerpc-4.1-3' of git://git./linux/kernel/git/mpe/linux

Pull powerpc fixes from Michael Ellerman:
 - build fix for SMP=n in book3s_xics.c
 - fix for Daniel's pci_controller_ops on powernv.
 - revert the TM syscall abort patch for now.
 - CPU affinity fix from Nathan.
 - two EEH fixes from Gavin.
 - fix for CR corruption from Sam.
 - selftest build fix.

* tag 'powerpc-4.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
  powerpc/powernv: Restore non-volatile CRs after nap
  powerpc/eeh: Delay probing EEH device during hotplug
  powerpc/eeh: Fix race condition in pcibios_set_pcie_reset_state()
  powerpc/pseries: Correct cpu affinity for dlpar added cpus
  selftests/powerpc: Fix the pmu install rule
  Revert "powerpc/tm: Abort syscalls in active transactions"
  powerpc/powernv: Fix early pci_controller_ops loading.
  powerpc/kvm: Fix SMP=n build error in book3s_xics.c

9 years agoext4: fix growing of tiny filesystems
Jan Kara [Sun, 3 May 2015 03:58:32 +0000 (23:58 -0400)]
ext4: fix growing of tiny filesystems

The estimate of necessary transaction credits in ext4_flex_group_add()
is too pessimistic. It reserves credit for sb, resize inode, and resize
inode dindirect block for each group added in a flex group although they
are always the same block and thus it is enough to account them only
once. Also the number of modified GDT block is overestimated since we
fit EXT4_DESC_PER_BLOCK(sb) descriptors in one block.

Make the estimation more precise. That reduces number of requested
credits enough that we can grow 20 MB filesystem (which has 1 MB
journal, 79 reserved GDT blocks, and flex group size 16 by default).

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
9 years agoext4: move check under lock scope to close a race.
Davide Italiano [Sun, 3 May 2015 03:21:15 +0000 (23:21 -0400)]
ext4: move check under lock scope to close a race.

fallocate() checks that the file is extent-based and returns
EOPNOTSUPP in case is not. Other tasks can convert from and to
indirect and extent so it's safe to check only after grabbing
the inode mutex.

Signed-off-by: Davide Italiano <dccitaliano@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
9 years agoext4: fix data corruption caused by unwritten and delayed extents
Lukas Czerner [Sun, 3 May 2015 01:36:55 +0000 (21:36 -0400)]
ext4: fix data corruption caused by unwritten and delayed extents

Currently it is possible to lose whole file system block worth of data
when we hit the specific interaction with unwritten and delayed extents
in status extent tree.

The problem is that when we insert delayed extent into extent status
tree the only way to get rid of it is when we write out delayed buffer.
However there is a limitation in the extent status tree implementation
so that when inserting unwritten extent should there be even a single
delayed block the whole unwritten extent would be marked as delayed.

At this point, there is no way to get rid of the delayed extents,
because there are no delayed buffers to write out. So when a we write
into said unwritten extent we will convert it to written, but it still
remains delayed.

When we try to write into that block later ext4_da_map_blocks() will set
the buffer new and delayed and map it to invalid block which causes
the rest of the block to be zeroed loosing already written data.

For now we can fix this by simply not allowing to set delayed status on
written extent in the extent status tree. Also add WARN_ON() to make
sure that we notice if this happens in the future.

This problem can be easily reproduced by running the following xfs_io.

xfs_io -f -c "pwrite -S 0xaa 4096 2048" \
          -c "falloc 0 131072" \
          -c "pwrite -S 0xbb 65536 2048" \
          -c "fsync" /mnt/test/fff

echo 3 > /proc/sys/vm/drop_caches
xfs_io -c "pwrite -S 0xdd 67584 2048" /mnt/test/fff

This can be theoretically also reproduced by at random by running fsx,
but it's not very reliable, though on machines with bigger page size
(like ppc) this can be seen more often (especially xfstest generic/127)

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
9 years agoext4 crypto: remove duplicated encryption mode definitions
Chanho Park [Sat, 2 May 2015 14:29:22 +0000 (10:29 -0400)]
ext4 crypto: remove duplicated encryption mode definitions

This patch removes duplicated encryption modes which were already in
ext4.h. They were duplicated from commit 3edc18d and commit f542fb.

Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
9 years agoext4 crypto: do not select from EXT4_FS_ENCRYPTION
Herbert Xu [Sat, 2 May 2015 14:29:19 +0000 (10:29 -0400)]
ext4 crypto: do not select from EXT4_FS_ENCRYPTION

This patch adds a tristate EXT4_ENCRYPTION to do the selections
for EXT4_FS_ENCRYPTION because selecting from a bool causes all
the selected options to be built-in, even if EXT4 itself is a
module.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
9 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Sat, 2 May 2015 03:51:04 +0000 (20:51 -0700)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Receive packet length needs to be adjust by 2 on RX to accomodate
    the two padding bytes in altera_tse driver.  From Vlastimil Setka.

 2) If rx frame is dropped due to out of memory in macb driver, we leave
    the receive ring descriptors in an undefined state.  From Punnaiah
    Choudary Kalluri

 3) Some netlink subsystems erroneously signal NLM_F_MULTI.  That is
    only for dumps.  Fix from Nicolas Dichtel.

 4) Fix mis-use of raw rt->rt_pmtu value in ipv4, one must always go via
    the ipv4_mtu() helper.  From Herbert Xu.

 5) Fix null deref in bridge netfilter, and miscalculated lengths in
    jump/goto nf_tables verdicts.  From Florian Westphal.

 6) Unhash ping sockets properly.

 7) Software implementation of BPF divide did 64/32 rather than 64/64
    bit divide.  The JITs got it right.  Fix from Alexei Starovoitov.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (30 commits)
  ipv4: Missing sk_nulls_node_init() in ping_unhash().
  net: fec: Fix RGMII-ID mode
  net/mlx4_en: Schedule napi when RX buffers allocation fails
  netxen_nic: use spin_[un]lock_bh around tx_clean_lock
  net/mlx4_core: Fix unaligned accesses
  mlx4_en: Use correct loop cursor in error path.
  cxgb4: Fix MC1 memory offset calculation
  bnx2x: Delay during kdump load
  net: Fix Kernel Panic in bonding driver debugfs file: rlb_hash_table
  net: dsa: Fix scope of eeprom-length property
  net: macb: Fix race condition in driver when Rx frame is dropped
  hv_netvsc: Fix a bug in netvsc_start_xmit()
  altera_tse: Correct rx packet length
  mlx4: Fix tx ring affinity_mask creation
  tipc: fix problem with parallel link synchronization mechanism
  tipc: remove wrong use of NLM_F_MULTI
  bridge/nl: remove wrong use of NLM_F_MULTI
  bridge/mdb: remove wrong use of NLM_F_MULTI
  net: sched: act_connmark: don't zap skb->nfct
  trivial: net: systemport: bcmsysport.h: fix 0x0x prefix
  ...