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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: 6c70794500 ("rocker: implement L2 bridge offloading")
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman 2015-03-24 09:31:40 +09:00 committed by David S. Miller
parent d079535d5e
commit a6e95cc718
1 changed files with 7 additions and 1 deletions
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8
drivers/net/ethernet/rocker/rocker.c
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@ -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;