netdev - Re: [PATCH net-next-2.6] veth: Fix veth

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Date:	Fri, 30 Oct 2009 16:07:51 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH net-next-2.6] veth: Fix veth_dellink method

Eric Dumazet <eric.dumazet@...il.com> writes:

> In commit 23289a37e2b127dfc4de1313fba15bb4c9f0cd5b
> (net: add a list_head parameter to dellink() method),
> I forgot to actually use this parameter in veth_dellink.
>
> I remember feeling a bit uncomfortable about veth_close(),
> because it does :
>
> netif_carrier_off(dev);
> netif_carrier_off(priv->peer);
>
>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
>
> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index ffb502d..9bed694 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -450,8 +450,8 @@ static void veth_dellink(struct net_device *dev, struct list_head *head)
>  	priv = netdev_priv(dev);
>  	peer = priv->peer;
>  
> -	unregister_netdevice(dev);
> -	unregister_netdevice(peer);
> +	unregister_netdevice_queue(dev, head);
> +	unregister_netdevice_queue(peer, head);

Unless I am mistaken you need to change the list_add_tail to
list_move_tail in unregister_netdevice_queue because we will be
adding each veth device twice.

Eric
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