netdev - Re: [PATCH 2/2] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev

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Message-Id: <20130930.223026.2029777905853837614.davem@davemloft.net>
Date:	Mon, 30 Sep 2013 22:30:26 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	noureddine@...stanetworks.com
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] ipv6 mcast: use in6_dev_put in timer handlers
 instead of __in6_dev_put

From: Salam Noureddine <noureddine@...stanetworks.com>
Date: Sun, 29 Sep 2013 13:41:34 -0700

> It is possible for the timer handlers to run after the call to
> ipv6_mc_down so use in6_dev_put instead of __in6_dev_put in the
> handler function in order to do proper cleanup when the refcnt
> reaches 0. Otherwise, the refcnt can reach zero without the
> inet6_dev being destroyed and we end up leaking a reference to
> the net_device and see messages like the following,
> 
> unregister_netdevice: waiting for eth0 to become free. Usage count = 1
> 
> Tested on linux-3.4.43.
> 
> Signed-off-by: Salam Noureddine <noureddine@...stanetworks.com>

Applied and queued up for -stable.
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