net: forbid underlaying devices to change its type

[pandora-kernel.git] / net / 8021q / vlan.c

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 4535122..c39a5f4 100644 (file)
--- 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: