MD: Add del_timer_sync to mddev_suspend (fix nasty panic)
Use del_timer_sync to remove timer before mddev_suspend finishes. We don't want a timer going off after an mddev_suspend is called. This is especially true with device-mapper, since it can call the destructor function immediately following a suspend. This results in the removal (kfree) of the structures upon which the timer depends - resulting in a very ugly panic. Therefore, we add a del_timer_sync to mddev_suspend to prevent this. Cc: stable@vger.kernel.org Signed-off-by: NeilBrown <neilb@suse.de>
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@ -391,6 +391,8 @@ void mddev_suspend(struct mddev *mddev)
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synchronize_rcu();
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wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
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mddev->pers->quiesce(mddev, 1);
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del_timer_sync(&mddev->safemode_timer);
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}
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EXPORT_SYMBOL_GPL(mddev_suspend);
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