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MD: Add del_timer_sync to mddev_suspend (fix nasty panic)

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commit 0d9f4f135e upstream.

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.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jonathan Brassow
2012-05-16 04:06:14 -05:00
committed by Greg Kroah-Hartman
parent 04a4aeb405
commit f4f388bce9
1 changed files with 2 additions and 0 deletions
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2
drivers/md/md.c
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@@ -348,6 +348,8 @@ void mddev_suspend(mddev_t *mddev)
synchronize_rcu();
wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
mddev->pers->quiesce(mddev, 1);
del_timer_sync(&mddev->safemode_timer);
}
EXPORT_SYMBOL_GPL(mddev_suspend);