net: dsa: Deny enslaving VLAN devices into VLAN aware bridge

	return err;

}

static int dsa_slave_upper_vlan_check(struct net_device *dev,

				      struct netdev_notifier_changeupper_info *

				      info)

{

	struct netlink_ext_ack *ext_ack;

	struct net_device *slave;

	struct dsa_port *dp;

	ext_ack = netdev_notifier_info_to_extack(&info->info);

	if (!is_vlan_dev(dev))

		return NOTIFY_DONE;

	slave = vlan_dev_real_dev(dev);

	if (!dsa_slave_dev_check(slave))

		return NOTIFY_DONE;

	dp = dsa_slave_to_port(slave);

	if (!dp->bridge_dev)

		return NOTIFY_DONE;

	/* Deny enslaving a VLAN device into a VLAN-aware bridge */

	if (br_vlan_enabled(dp->bridge_dev) &&

	    netif_is_bridge_master(info->upper_dev) && info->linking) {

		NL_SET_ERR_MSG_MOD(ext_ack,

				   "Cannot enslave VLAN device into VLAN aware bridge");

		return notifier_from_errno(-EINVAL);

	}

	return NOTIFY_DONE;

}

static int dsa_slave_netdevice_event(struct notifier_block *nb,

				     unsigned long event, void *ptr)

{

	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

	if (event == NETDEV_CHANGEUPPER) {

		if (!dsa_slave_dev_check(dev))

		return NOTIFY_DONE;

			return dsa_slave_upper_vlan_check(dev, ptr);

	if (event == NETDEV_CHANGEUPPER)

		return dsa_slave_changeupper(dev, ptr);

	}

	return NOTIFY_DONE;

}