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_if.c b/net/bridge/br_if.c
index 427f90a..d9d1e2b 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -475,7 +475,7 @@
 {
 	struct net_bridge_port *p;
 
-	p = br_port_get(dev);
+	p = br_port_get_rtnl(dev);
 	if (!p || p->br != br)
 		return -EINVAL;