Commit b03804e7 authored Dec 03, 2015 by Ido Schimmel Committed by David S. Miller Dec 03, 2015

net: Check CHANGEUPPER notifier return value



switchdev drivers reflect the newly requested topology to hardware when
CHANGEUPPER is received, after software links were already formed.
However, the operation can fail and user will not be notified, as the
return value of the notifier is not checked.

Add this check and rollback software links if necessary.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 3b195843

net/core/dev.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -5490,8 +5490,12 @@ static int __netdev_upper_dev_link(struct net_device *dev,
		goto rollback_lower_mesh;
		}

		call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
		ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
		&changeupper_info.info);
		ret = notifier_to_errno(ret);
		if (ret)
		goto rollback_lower_mesh;

		return 0;

		rollback_lower_mesh: