xen/acpi-processor: fix enabling interrupts on syscore_resume
authorStanislaw Gruszka <sgruszka@redhat.com>
Wed, 26 Feb 2014 10:30:30 +0000 (11:30 +0100)
committerDavid Vrabel <david.vrabel@citrix.com>
Tue, 18 Mar 2014 14:40:20 +0000 (14:40 +0000)
commitcd979883b9ede90643e019f33cb317933eb867b4
treee98a9654826b2396f7b01b65300c0a68946b9e33
parent1429d46df4c538d28460d0b493997006a62a1093
xen/acpi-processor: fix enabling interrupts on syscore_resume

syscore->resume() callback is expected to do not enable interrupts,
it generates warning like below otherwise:

[ 9386.365390] WARNING: CPU: 0 PID: 6733 at drivers/base/syscore.c:104 syscore_resume+0x9a/0xe0()
[ 9386.365403] Interrupts enabled after xen_acpi_processor_resume+0x0/0x34 [xen_acpi_processor]
...
[ 9386.365429] Call Trace:
[ 9386.365434]  [<ffffffff81667a8b>] dump_stack+0x45/0x56
[ 9386.365437]  [<ffffffff8106921d>] warn_slowpath_common+0x7d/0xa0
[ 9386.365439]  [<ffffffff8106928c>] warn_slowpath_fmt+0x4c/0x50
[ 9386.365442]  [<ffffffffa0261bb0>] ? xen_upload_processor_pm_data+0x300/0x300 [xen_acpi_processor]
[ 9386.365443]  [<ffffffff814055fa>] syscore_resume+0x9a/0xe0
[ 9386.365445]  [<ffffffff810aef42>] suspend_devices_and_enter+0x402/0x470
[ 9386.365447]  [<ffffffff810af128>] pm_suspend+0x178/0x260

On xen_acpi_processor_resume() we call various procedures, which are
non atomic and can enable interrupts. To prevent the issue introduce
separate resume notify called after we enable interrupts on resume
and before we call other drivers resume callbacks.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
drivers/xen/manage.c
drivers/xen/xen-acpi-processor.c
include/xen/xen-ops.h