security,rcu: convert call_rcu(user_update_rcu_disposal) to kfree_rcu()

The rcu callback user_update_rcu_disposal() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(user_update_rcu_disposal).

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 2 insertions, 14 deletions

diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index c6ca8662a468..f66baf44f32d 100644
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -69,18 +69,6 @@ error:
 EXPORT_SYMBOL_GPL(user_instantiate);
 
 /*
- * dispose of the old data from an updated user defined key
- */
-static void user_update_rcu_disposal(struct rcu_head *rcu)
-{
-        struct user_key_payload *upayload;
-
-        upayload = container_of(rcu, struct user_key_payload, rcu);
-
-        kfree(upayload);
-}
-
-/*
  * update a user defined key
  * - the key's semaphore is write-locked
  */
@@ -114,7 +102,7 @@ int user_update(struct key *key, const void *data, size_t datalen)
                 key->expiry = 0;
         }
 
-        call_rcu(&zap->rcu, user_update_rcu_disposal);
+        kfree_rcu(zap, rcu);
 
 error:
         return ret;
@@ -145,7 +133,7 @@ void user_revoke(struct key *key)
 
         if (upayload) {
                 rcu_assign_pointer(key->payload.data, NULL);
-                call_rcu(&upayload->rcu, user_update_rcu_disposal);
+                kfree_rcu(upayload, rcu);
         }
 }