NeilBrown 29f097c4d9 md: fix some places where mddev_lock return value is not checked.
Sometimes we need to lock and mddev and cannot cope with
failure due to interrupt.
In these cases we should use mutex_lock, not mutex_lock_interruptible.

Signed-off-by: NeilBrown <neilb@suse.de>
2013-11-19 15:19:17 +11:00
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