ACPI / PM: Hold acpi_scan_lock over system PM transitions

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Bad things happen if ACPI hotplug events are handled during system
PM transitions, especially if devices are removed as a result.
To prevent those bad things from happening, acquire acpi_scan_lock
when a PM transition is started and release it when that transition
is complete or has been aborted.

This fixes resume lockup on my test-bed Acer Aspire S5 that happens
when Thunderbolt devices are disconnected from the machine while
suspended.

Also fixes the analogous problem for Mika Westerberg on an
Intel DZ77RE-75K board.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>

...

This commit is contained in:

Rafael J. Wysocki 2013-08-20 01:42:32 +02:00

parent 1aaac07112

commit ad07277e82

1 changed files with 24 additions and 15 deletions

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39

drivers/acpi/sleep.c

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