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PM / core: Fix bug in the error handling of async suspend

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If async_suspend is enabled for parent and child devices, then
PM framework has to ensure that parent's async suspend gets called
only after child's async suspend is done. In case if child's async
suspend fails with error, then parent's async suspend must not be
invoked. The current code uses async_error to ensure this but there
is a problem with it in __device_suspend(). This function notifies
the completion of child's async suspend before updating its error
via async_error variable. As a result, parent's async suspend gets
invoked even though it's child suspend has failed. Fix this bug by
updating the async_error before notifying the child's completion.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
[ rjw: Rearranged wthitespace ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sahitya Tummala 2016-12-07 20:10:32 +05:30 committed by Rafael J. Wysocki
parent bed570307e
commit 05a9262277
1 changed files with 1 additions and 1 deletions
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2
drivers/base/power/main.c
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@ -1460,10 +1460,10 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
dpm_watchdog_clear(&wd);
Complete:
complete_all(&dev->power.completion);
if (error)
async_error = error;
complete_all(&dev->power.completion);
TRACE_SUSPEND(error);
return error;
}