bridge: add RCU annotations to bridge port lookup

br_port_get() renamed to br_port_get_rtnl() to make clear RTNL is held.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index e3de0a4..f8bf4c7 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -119,7 +119,7 @@
 
 	idx = 0;
 	for_each_netdev(net, dev) {
-		struct net_bridge_port *port = br_port_get(dev);
+		struct net_bridge_port *port = br_port_get_rtnl(dev);
 
 		/* not a bridge port */
 		if (!port || idx < cb->args[0])
@@ -171,7 +171,7 @@
 	if (!dev)
 		return -ENODEV;
 
-	p = br_port_get(dev);
+	p = br_port_get_rtnl(dev);
 	if (!p)
 		return -EINVAL;