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PM: Allow wakeup events to abort freezing of tasks

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If there is a wakeup event during the freezing of tasks, suspend or
hibernation will fail anyway.  Since try_to_freeze_tasks() can take
up to 20 seconds to complete or fail, aborting it as soon as a wakeup
event is detected improves the worst case wakeup latency.

Based on a patch from Arve Hjønnevåg.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Rafael J. Wysocki 2010-10-04 22:07:32 +02:00
parent 5fc62aad4e
commit dbeeec5fe8
2 changed files with 11 additions and 2 deletions
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include/linux/suspend.h
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@ -308,6 +308,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
}
#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
static inline bool pm_check_wakeup_events(void) { return true; }
#endif /* !CONFIG_PM_SLEEP */
extern struct mutex pm_mutex;