Messages in this thread Patch in this message | | | From | Sahitya Tummala <> | Subject | [PATCH] PM: Fix bug in the error handling of async suspend | Date | Wed, 7 Dec 2016 20:10:32 +0530 |
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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> --- drivers/base/power/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index e44944f4be77..f733f50f8321 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1460,9 +1460,9 @@ 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; -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
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