dm-thinp: check allocation failure

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
drivers/md/dm-thin.c | 4 ++++
1 file changed, 4 insertions(+)

Index: linux-3.0-fast/drivers/md/dm-thin.c
================================================== =================
--- linux-3.0-fast.orig/drivers/md/dm-thin.c 2011-08-04 18:07:18.000000000 +0200
+++ linux-3.0-fast/drivers/md/dm-thin.c 2011-08-04 18:07:37.000000000 +0200
@@ -160,6 +160,10 @@ static struct bio_prison *prison_create(
spin_lock_init(&prison->lock);
prison->cell_pool = mempool_create_kmalloc_pool(nr_cells,
sizeof(struct cell));
+ if (!prison->cell_pool) {
+ kfree(prison);
+ return NULL;
+ }
prison->nr_buckets = nr_buckets;
prison->hash_mask = nr_buckets - 1;
prison->cells = (struct hlist_head *) (prison + 1);

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