[PATCH] device-mapper: dm-raid1 deadlock fix

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>

drivers/md/dm-raid1.c

@@ -253,9 +253,9 @@ static struct region *__rh_alloc(struct region_hash *rh, region_t region)
 	else {
 		__rh_insert(rh, nreg);
 		if (nreg->state == RH_CLEAN) {
-			spin_lock_irq(&rh->region_lock);
+			spin_lock(&rh->region_lock);
 			list_add(&nreg->list, &rh->clean_regions);
-			spin_unlock_irq(&rh->region_lock);
+			spin_unlock(&rh->region_lock);
 		}
 		reg = nreg;
 	}