From: Rafael J. Wysocki Date: Fri, 17 Feb 2012 22:39:33 +0000 (+0100) Subject: PM / Sleep: Fix race conditions related to wakeup source timer function X-Git-Tag: v3.4-rc1~173^2~7^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da863cddd831b0f4bf2d067f8b75254f1be94590;p=pandora-kernel.git PM / Sleep: Fix race conditions related to wakeup source timer function If __pm_wakeup_event() has been used (with a nonzero timeout) to report a wakeup event and then __pm_relax() immediately followed by __pm_stay_awake() is called or __pm_wakeup_event() is called once again for the same wakeup source object before its timer expires, the timer function pm_wakeup_timer_fn() may still be run as a result of the previous __pm_wakeup_event() call. In either of those cases it may mistakenly deactivate the wakeup source that has just been activated. To prevent that from happening, make wakeup_source_deactivate() clear the wakeup source's timer_expires field and make pm_wakeup_timer_fn() check if timer_expires is different from zero and if it's not in future before calling wakeup_source_deactivate() (if timer_expires is 0, it means that the timer has just been deleted and if timer_expires is in future, it means that the timer has just been rescheduled to a different time). Reported-by: Arve Hjønnevåg Signed-off-by: Rafael J. Wysocki --- Reading git-diff-tree failed