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PM / Sleep: Prevent waiting forever on asynchronous suspend after abort 

__device_suspend() must always send a completion. Otherwise, parent
devices will wait forever.

Commit 1e2ef05b, "PM: Limit race conditions between runtime PM and
system sleep (v2)", introduced a regression by short-circuiting the
complete_all() for certain error cases.

This patch fixes the bug by always signalling a completion.

Addresses http://crosbug.com/31972

Tested by injecting an abort.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Mandeep Singh Baines 2012-06-24 23:31:09 +02:00 committed by Rafael J. Wysocki
parent 6b16351acb
commit 1f758b2317
1 changed files with 4 additions and 2 deletions
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6
drivers/base/power/main.c
View File

@ -1031,7 +1031,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
dpm_wait_for_children(dev, async);
if (async_error)
return 0;
goto Complete;
pm_runtime_get_noresume(dev);
if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
@ -1040,7 +1040,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
if (pm_wakeup_pending()) {
pm_runtime_put_sync(dev);
async_error = -EBUSY;
return 0;
goto Complete;
}
device_lock(dev);
@ -1097,6 +1097,8 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
}
device_unlock(dev);
Complete:
complete_all(&dev->power.completion);
if (error) {