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PM / Sleep: avoid 'autosleep' in shutdown progress

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Prevent automatic system suspend from happening during system
shutdown by making try_to_suspend() check system_state and return
immediately if it is not SYSTEM_RUNNING.

This prevents the following breakage from happening (scenario from
Zhang Yanmin):

 Kernel starts shutdown and calls all device driver's shutdown
 callback.  When a driver's shutdown is called, the last wakelock is
 released and suspend-to-ram starts.  However, as some driver's shut
 down callbacks already shut down devices and disabled runtime pm,
 the suspend-to-ram calls driver's suspend callback without noticing
 that device is already off and causes crash.

[rjw: Changelog]
Signed-off-by: Liu ShuoX <shuox.liu@intel.com>
Cc: 3.5+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Liu ShuoX 2013-07-11 16:03:45 +08:00 committed by Rafael J. Wysocki
parent aae760ed21
commit e5248a111b
1 changed files with 2 additions and 1 deletions
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3
kernel/power/autosleep.c
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@ -32,7 +32,8 @@ static void try_to_suspend(struct work_struct *work)
mutex_lock(&autosleep_lock);
if (!pm_save_wakeup_count(initial_count)) {
if (!pm_save_wakeup_count(initial_count) ||
system_state != SYSTEM_RUNNING) {
mutex_unlock(&autosleep_lock);
goto out;
}