From: Heinz Mauelshagen <heinzm@redhat.com>

If the cache policy's config values are not able to be set we must 
set the policy to NULL after destroying it in create_cache_policy()
so we don't attempt to destroy it a second time later.
 
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

---
 drivers/md/dm-cache-target.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux/drivers/md/dm-cache-target.c
===================================================================
--- linux.orig/drivers/md/dm-cache-target.c
+++ linux/drivers/md/dm-cache-target.c
@@ -1763,8 +1763,11 @@ static int create_cache_policy(struct ca
 	}
 
 	r = set_config_values(cache->policy, ca->policy_argc, ca->policy_argv);
-	if (r)
+	if (r) {
+		*error = "Error setting cache policy's config values";
 		dm_cache_policy_destroy(cache->policy);
+		cache->policy = NULL;
+	}
 
 	return r;
 }