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-rw-r--r--drivers/net/macvlan.c3
-rw-r--r--net/8021q/vlan.c4
-rw-r--r--net/bridge/br_notify.c4
3 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 40faa36..445e73c 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -748,6 +748,9 @@ static int macvlan_device_event(struct notifier_block *unused,
list_for_each_entry_safe(vlan, next, &port->vlans, list)
vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
break;
+ case NETDEV_PRE_TYPE_CHANGE:
+ /* Forbid underlaying device to change its type. */
+ return NOTIFY_BAD;
}
return NOTIFY_DONE;
}
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 4535122..c39a5f4 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:
diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c
index 763a3ec..1413b72 100644
--- a/net/bridge/br_notify.c
+++ b/net/bridge/br_notify.c
@@ -82,6 +82,10 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
case NETDEV_UNREGISTER:
br_del_if(br, dev);
break;
+
+ case NETDEV_PRE_TYPE_CHANGE:
+ /* Forbid underlaying device to change its type. */
+ return NOTIFY_BAD;
}
/* Events that may cause spanning tree to refresh */
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