From: Colin Cross Date: Thu, 2 Sep 2010 23:24:07 +0000 (+0200) Subject: PM: Prevent waiting forever on asynchronous resume after failing suspend X-Git-Tag: v2.6.35.6~14 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2af3495b6359c30740b31175aa818f600f5b8bb9;p=thirdparty%2Fkernel%2Fstable.git PM: Prevent waiting forever on asynchronous resume after failing suspend commit 152e1d592071c8b312bb898bc1118b64e4aea535 upstream. During suspend, the power.completion is expected to be set when a device has not yet started suspending. Set it on init to fix a corner case where a device is resumed when its parent has never suspended. Consider three drivers, A, B, and C. The parent of A is C, and C has async_suspend set. On boot, C->power.completion is initialized to 0. During the first suspend: suspend_devices_and_enter(...) dpm_resume(...) device_suspend(A) device_suspend(B) returns error, aborts suspend dpm_resume_end(...) dpm_resume(...) device_resume(A) dpm_wait(A->parent == C) wait_for_completion(C->power.completion) The wait_for_completion will never complete, because complete_all(C->power.completion) will only be called from device_suspend(C) or device_resume(C), neither of which is called if suspend is aborted before C. After a successful suspend->resume cycle, where B doesn't abort suspend, C->power.completion is left in the completed state by the call to device_resume(C), and the same call path will work if B aborts suspend. Signed-off-by: Colin Cross Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 941fcb87e52a1..cb1cedc69c9bd 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -59,6 +59,7 @@ void device_pm_init(struct device *dev) { dev->power.status = DPM_ON; init_completion(&dev->power.completion); + complete_all(&dev->power.completion); pm_runtime_init(dev); }