1 files changed, 4 insertions, 0 deletions

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 453512266ea1..c39a5f41169c 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -530,6 +530,10 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
                 }
                 unregister_netdevice_many(&list);
                 break;
+
+        case NETDEV_PRE_TYPE_CHANGE:
+                /* Forbid underlaying device to change its type. */
+                return NOTIFY_BAD;
         }
 
 out: