From 29f097c4d968021ee4fad1b033be5825ff78330e Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Thu, 14 Nov 2013 17:54:51 +1100
Subject: [PATCH] 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>
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