PM / sleep / x86: Fix crash on graph trace through x86 suspend

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[ Upstream commit 92f9e179a7 ]

Pause/unpause graph tracing around do_suspend_lowlevel as it has
inconsistent call/return info after it jumps to the wakeup vector.
The graph trace buffer will otherwise become misaligned and
may eventually crash and hang on suspend.

To reproduce the issue and test the fix:
Run a function_graph trace over suspend/resume and set the graph
function to suspend_devices_and_enter. This consistently hangs the
system without this fix.

Signed-off-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

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Todd E Brandt 2016-03-02 16:05:29 -08:00 • committed by Sasha Levin

parent 613ef52746

commit d9b930d53b

1 changed files with 7 additions and 0 deletions

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arch/x86/kernel/acpi/sleep.c

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