bridge: switch order of rx_handler reg and upper dev link

The thing is that netdev_master_upper_dev_link calls
call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev). That generates rtnl
link message and during that, rtnl_link_ops->fill_slave_info is called.
But with current ordering, rx_handler and IFF_BRIDGE_PORT are not set
yet so there would have to be check for that in fill_slave_info callback.

Resolve this by reordering to similar what bonding and team does to
avoid the check.

Also add removal of IFF_BRIDGE_PORT flag into error path.
Signed-off-by: NJiri Pirko <jiri@resnulli.us>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_if.c

@@ -252,12 +252,12 @@ static void del_nbp(struct net_bridge_port *p)
 	br_fdb_delete_by_port(br, p, 1);
 	nbp_update_port_count(br);
 
+	netdev_upper_dev_unlink(dev, br->dev);
+
 	dev->priv_flags &= ~IFF_BRIDGE_PORT;
 
 	netdev_rx_handler_unregister(dev);
 
-	netdev_upper_dev_unlink(dev, br->dev);
-
 	br_multicast_del_port(p);
 
 	kobject_uevent(&p->kobj, KOBJ_REMOVE);
@@ -476,16 +476,16 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 	if (err)
 		goto err3;
 
-	err = netdev_master_upper_dev_link(dev, br->dev);
+	err = netdev_rx_handler_register(dev, br_handle_frame, p);
 	if (err)
 		goto err4;
 
-	err = netdev_rx_handler_register(dev, br_handle_frame, p);
+	dev->priv_flags |= IFF_BRIDGE_PORT;
+
+	err = netdev_master_upper_dev_link(dev, br->dev);
 	if (err)
 		goto err5;
 
-	dev->priv_flags |= IFF_BRIDGE_PORT;
-
 	dev_disable_lro(dev);
 
 	list_add_rcu(&p->list, &br->port_list);
@@ -520,7 +520,8 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 	return 0;
 
 err5:
-	netdev_upper_dev_unlink(dev, br->dev);
+	dev->priv_flags &= ~IFF_BRIDGE_PORT;
+	netdev_rx_handler_unregister(dev);
 err4:
 	br_netpoll_disable(p);
 err3: