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| author |   Mandeep Singh Baines <msb@chromium.org> | 2012-06-24 23:31:09 +0200 |
|---|---|---|
| committer |   Rafael J. Wysocki <rjw@sisk.pl> | 2012-06-24 23:31:09 +0200 |
| commit | 1f758b23177d588a71b96ad02990e715949bb82f (patch) | |
| tree | 2854e0209da918af16084d2f6a009318336fb87a /drivers/base/power/main.c | |
| parent | Linux 3.5-rc4 (diff) | |
| download | linux-dev-1f758b23177d588a71b96ad02990e715949bb82f.tar.xz linux-dev-1f758b23177d588a71b96ad02990e715949bb82f.zip | |
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 '')
| -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 e0fb5b0435a3..9cb845e49334 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) { |