diff options
| author | Mandeep Singh Baines <msb@chromium.org> | 2012-06-24 21:31:09 (GMT) |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-06-24 21:31:09 (GMT) |
| commit | 1f758b23177d588a71b96ad02990e715949bb82f (patch) | |
| tree | 2854e0209da918af16084d2f6a009318336fb87a /drivers/base/power | |
| parent | 6b16351acbd415e66ba16bf7d473ece1574cf0bc (diff) | |
| download | linux-1f758b23177d588a71b96ad02990e715949bb82f.tar.xz | |
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>
Diffstat (limited to 'drivers/base/power')
| -rw-r--r-- | drivers/base/power/main.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index e0fb5b0..9cb845e 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -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) { |