veth: Fix unregister_netdevice_queue for veth

I tested the recent unregister many changes and got a weird,
nasty and seemingly unrelasted kernel oops. Changing
unregister_netdevice_queue to use list_move_tail fixes
the problem for me.

ip link add type veth
rmmod veth

ls /sys/class/net/
showed one of the veth devices still present.

A subsequent ip link oopsed the box.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index f54d8b8..3c40d54 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5258,6 +5258,7 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
        netdev_init_queues(dev);
 
        INIT_LIST_HEAD(&dev->napi_list);
+       INIT_LIST_HEAD(&dev->unreg_list);
        dev->priv_flags = IFF_XMIT_DST_RELEASE;
        setup(dev);
        strcpy(dev->name, name);
@@ -5339,7 +5340,7 @@ void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
        ASSERT_RTNL();
 
        if (head) {
-               list_add_tail(&dev->unreg_list, head);
+               list_move_tail(&dev->unreg_list, head);
        } else {
                rollback_registered(dev);
                /* Finish processing unregister after unlock */