net,rcu: convert call_rcu(sctp_local_addr_free) to kfree_rcu()

The rcu callback sctp_local_addr_free() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(sctp_local_addr_free).
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

include/net/sctp/sctp.h

@@ -115,7 +115,6 @@
  * sctp/protocol.c
  */
 extern struct sock *sctp_get_ctl_sock(void);
-extern void sctp_local_addr_free(struct rcu_head *head);
 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
 				     sctp_scope_t, gfp_t gfp,
 				     int flags);

net/sctp/bind_addr.c

@@ -219,7 +219,7 @@ int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
 	}
 
 	if (found) {
-		call_rcu(&addr->rcu, sctp_local_addr_free);
+		kfree_rcu(addr, rcu);
 		SCTP_DBG_OBJCNT_DEC(addr);
 		return 0;
 	}

net/sctp/ipv6.c

@@ -123,7 +123,7 @@ static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
 		}
 		spin_unlock_bh(&sctp_local_addr_lock);
 		if (found)
-			call_rcu(&addr->rcu, sctp_local_addr_free);
+			kfree_rcu(addr, rcu);
 		break;
 	}
 

net/sctp/protocol.c

@@ -230,13 +230,6 @@ static void sctp_free_local_addr_list(void)
 	}
 }
 
-void sctp_local_addr_free(struct rcu_head *head)
-{
-	struct sctp_sockaddr_entry *e = container_of(head,
-				struct sctp_sockaddr_entry, rcu);
-	kfree(e);
-}
-
 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 			      gfp_t gfp, int copy_flags)
@@ -681,7 +674,7 @@ static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 		}
 		spin_unlock_bh(&sctp_local_addr_lock);
 		if (found)
-			call_rcu(&addr->rcu, sctp_local_addr_free);
+			kfree_rcu(addr, rcu);
 		break;
 	}