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authorAlan Stern <stern@rowland.harvard.edu>2012-03-26 22:46:52 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-03-26 22:46:52 +0200
commitf2791d733a2f06997b573d1a3cfde21e6f529826 (patch)
tree2af5d3beba35cb4b5a945f148e0a24bbda0ed86f /drivers/base/power
parente22057c8599373e5caef0bc42bdb95d2a361ab0d (diff)
downloadop-kernel-dev-f2791d733a2f06997b573d1a3cfde21e6f529826.zip
op-kernel-dev-f2791d733a2f06997b573d1a3cfde21e6f529826.tar.gz
PM / Runtime: don't forget to wake up waitqueue on failure
This patch (as1535) fixes a bug in the runtime PM core. When a runtime suspend attempt completes, whether successfully or not, the device's power.wait_queue is supposed to be signalled. But this doesn't happen in the failure pathway of rpm_suspend() when another autosuspend attempt is rescheduled. As a result, a task can get stuck indefinitely on the wait queue (I have seen this happen in testing). The patch fixes the problem by moving the wake_up_all() call up near the start of the failure code. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> 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/runtime.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 541f821..bd0f394 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -532,6 +532,8 @@ static int rpm_suspend(struct device *dev, int rpmflags)
dev->power.suspend_time = ktime_set(0, 0);
dev->power.max_time_suspended_ns = -1;
dev->power.deferred_resume = false;
+ wake_up_all(&dev->power.wait_queue);
+
if (retval == -EAGAIN || retval == -EBUSY) {
dev->power.runtime_error = 0;
@@ -547,7 +549,6 @@ static int rpm_suspend(struct device *dev, int rpmflags)
} else {
pm_runtime_cancel_pending(dev);
}
- wake_up_all(&dev->power.wait_queue);
goto out;
}
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