netdev - Re: [PATCH v2 net] ipv6: clean up anycast when an interface is destroyed

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Message-Id: <20140912.173328.853747388797023828.davem@davemloft.net>
Date:	Fri, 12 Sep 2014 17:33:28 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sd@...asysnail.net
Cc:	cwang@...pensource.com, netdev@...r.kernel.org,
	hannes@...essinduktion.org
Subject: Re: [PATCH v2 net] ipv6: clean up anycast when an interface is
 destroyed

From: Sabrina Dubroca <sd@...asysnail.net>
Date: Wed, 10 Sep 2014 23:23:02 +0200

> If we try to rmmod the driver for an interface while sockets with
> setsockopt(JOIN_ANYCAST) are alive, some refcounts aren't cleaned up
> and we get stuck on:
> 
>   unregister_netdevice: waiting for ens3 to become free. Usage count = 1
> 
> If we LEAVE_ANYCAST/close everything before rmmod'ing, there is no
> problem.
> 
> We need to perform a cleanup similar to the one for multicast in
> addrconf_ifdown(how == 1).
> 
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
> ---
> v2: remove comment

Applied, thank you.
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