[NEIGH]: Combine neighbour cleanup and release

Introduces neigh_cleanup_and_release() to be used after a
neighbour has been removed from its neighbour table. Serves
as preparation to add event notifications.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/neighbour.c

@@ -105,6 +105,14 @@ static int neigh_blackhole(struct sk_buff *skb)
 	return -ENETDOWN;
 }
 
+static void neigh_cleanup_and_release(struct neighbour *neigh)
+{
+	if (neigh->parms->neigh_cleanup)
+		neigh->parms->neigh_cleanup(neigh);
+
+	neigh_release(neigh);
+}
+
 /*
  * It is random distribution in the interval (1/2)*base...(3/2)*base.
  * It corresponds to default IPv6 settings and is not overridable,
@@ -141,9 +149,7 @@ static int neigh_forced_gc(struct neigh_table *tbl)
 				n->dead = 1;
 				shrunk	= 1;
 				write_unlock(&n->lock);
-				if (n->parms->neigh_cleanup)
-					n->parms->neigh_cleanup(n);
-				neigh_release(n);
+				neigh_cleanup_and_release(n);
 				continue;
 			}
 			write_unlock(&n->lock);
@@ -214,9 +220,7 @@ static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev)
 				NEIGH_PRINTK2("neigh %p is stray.\n", n);
 			}
 			write_unlock(&n->lock);
-			if (n->parms->neigh_cleanup)
-				n->parms->neigh_cleanup(n);
-			neigh_release(n);
+			neigh_cleanup_and_release(n);
 		}
 	}
 }
@@ -677,9 +681,7 @@ static void neigh_periodic_timer(unsigned long arg)
 			*np = n->next;
 			n->dead = 1;
 			write_unlock(&n->lock);
-			if (n->parms->neigh_cleanup)
-				n->parms->neigh_cleanup(n);
-			neigh_release(n);
+			neigh_cleanup_and_release(n);
 			continue;
 		}
 		write_unlock(&n->lock);
@@ -2095,11 +2097,8 @@ void __neigh_for_each_release(struct neigh_table *tbl,
 			} else
 				np = &n->next;
 			write_unlock(&n->lock);
-			if (release) {
-				if (n->parms->neigh_cleanup)
-					n->parms->neigh_cleanup(n);
-				neigh_release(n);
-			}
+			if (release)
+				neigh_cleanup_and_release(n);
 		}
 	}
 }