[PATCH v2 net] rocker: handle non-bridge master change

Master change notifications may occur other than when joining or
leaving a bridge, for example when being added to or removed from
a bond or Open vSwitch.

Previously in those cases rocker_port_bridge_leave() was called
which results in a null-pointer dereference as rocker_port->bridge_dev
is NULL because there is no bridge device.

This patch makes provision for doing nothing in such cases.

Fixes: 6c7079450071f ("rocker: implement L2 bridge offloading")
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Scott Feldman <redacted>
Signed-off-by: Simon Horman <redacted>

---
* Lightly tested to the extent that a null-pointer dereference no longer
  occurs

v2
* Use rocker_port_is_bridged()
* Added Acks
---
 drivers/net/ethernet/rocker/rocker.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
index 9fb6948..5cecec2 100644
--- a/drivers/net/ethernet/rocker/rocker.c
+++ b/drivers/net/ethernet/rocker/rocker.c

@@ -4468,10 +4468,16 @@ static int rocker_port_master_changed(struct net_device *dev)
 	struct net_device *master = netdev_master_upper_dev_get(dev);
 	int err = 0;
 
+	/* There are currently three cases handled here:
+	 * 1. Joining a bridge
+	 * 2. Leaving a previously joined bridge
+	 * 3. Other, e.g. being added to or removed from a bond or openvswitch,
+	 *    in which case nothing is done
+	 */
 	if (master && master->rtnl_link_ops &&
 	    !strcmp(master->rtnl_link_ops->kind, "bridge"))
 		err = rocker_port_bridge_join(rocker_port, master);
-	else
+	else if (rocker_port_is_bridged(rocker_port))
 		err = rocker_port_bridge_leave(rocker_port);
 
 	return err;

-- 
2.1.4