Fix a dm-raid1 deadlock: nested spinlocks with _irq.
Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
From: Tim Burgess <tim.burgess@anu.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>