dm cache: return -EINVAL if the user specifies unknown cache policy

Return -EINVAL when the specified cache policy is unknown rather than
returning -ENOMEM.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/md/dm-cache-policy.c b/drivers/md/dm-cache-policy.c
index 21c03c570c06..d80057968407 100644
--- a/drivers/md/dm-cache-policy.c
+++ b/drivers/md/dm-cache-policy.c
@@ -119,13 +119,13 @@ struct dm_cache_policy *dm_cache_policy_create(const char *name,
         type = get_policy(name);
         if (!type) {
                 DMWARN("unknown policy type");
-                return NULL;
+                return ERR_PTR(-EINVAL);
         }
 
         p = type->create(cache_size, origin_size, cache_block_size);
         if (!p) {
                 put_policy(type);
-                return NULL;
+                return ERR_PTR(-ENOMEM);
         }
         p->private = type;