netdev - Re: [Patch] rtnetlink: call ->dellink on failure when ->newlink exists

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Date:	Sun, 15 Feb 2015 08:31:12 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	xiyou.wangcong@...il.com
Cc:	netdev@...r.kernel.org, ignacy.gawedzki@...en-communications.fr
Subject: Re: [Patch] rtnetlink: call ->dellink on failure when ->newlink
 exists

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Fri, 13 Feb 2015 13:56:53 -0800

> Ignacy reported that when eth0 is down and add a vlan device
> on top of it like:
> 
>   ip link add link eth0 name eth0.1 up type vlan id 1
> 
> We will get a refcount leak:
> 
>   unregister_netdevice: waiting for eth0.1 to become free. Usage count = 2
> 
> The problem is when rtnl_configure_link() fails in rtnl_newlink(),
> we simply call unregister_device(), but for stacked device like vlan,
> we almost do nothing when we unregister the upper device, more work
> is done when we unregister the lower device, so call its ->dellink().
> 
> Reported-by: Ignacy Gawedzki <ignacy.gawedzki@...en-communications.fr>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied, thanks.
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