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PM / Runtime: Ensure timer_expires is nonzero in pm_schedule_suspend()

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The runtime PM core code assumes that dev->power.timer_expires is
nonzero when the timer is scheduled, but it may become zero
incidentally in pm_schedule_suspend().  Prevent this from happening
by bumping dev->power.timer_expires up to 1 if it's 0 before calling
mod_timer().

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reported-by: Alan Stern <stern@rowland.harvard.edu>
This commit is contained in:
Rafael J. Wysocki 2009-12-03 21:03:57 +01:00
parent 63c9480170
commit 0ddf0ed1d4
1 changed files with 2 additions and 0 deletions
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2
drivers/base/power/runtime.c
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@ -625,6 +625,8 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay)
goto out;
dev->power.timer_expires = jiffies + msecs_to_jiffies(delay);
if (!dev->power.timer_expires)
dev->power.timer_expires = 1;
mod_timer(&dev->power.suspend_timer, dev->power.timer_expires);
out: