After commit
0ce1822c2a08 ("vxlan: add adjacent link to limit depth
level"), vxlan_changelink() could fail because of
netdev_adjacent_change_prepare().
netdev_adjacent_change_prepare() returns -EEXIST when old lower device
and new lower device are same.
(old lower device is "dst->remote_dev" and new lower device is "lowerdev")
So, before calling it, lowerdev should be NULL if these devices are same.
Test command1:
ip link add dummy0 type dummy
ip link add vxlan0 type vxlan dev dummy0 dstport 4789 vni 1
ip link set vxlan0 type vxlan ttl 5
RTNETLINK answers: File exists
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 0ce1822c2a08 ("vxlan: add adjacent link to limit depth level")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
if (err)
return err;
+ if (dst->remote_dev == lowerdev)
+ lowerdev = NULL;
+
err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
extack);
if (err)
mod_timer(&vxlan->age_timer, jiffies);
netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
- if (lowerdev && lowerdev != dst->remote_dev)
+ if (lowerdev && lowerdev != dst->remote_dev) {
dst->remote_dev = lowerdev;
-
- netdev_update_lockdep_key(lowerdev);
+ netdev_update_lockdep_key(lowerdev);
+ }
vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
return 0;
}