netdev - Re: [PATCH v4 1/1] igmp: call ip_mc_clear_src() only when we have no users of ip_mc

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Message-Id: <20110524.132825.968974982805294440.davem@davemloft.net>
Date:	Tue, 24 May 2011 13:28:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	vfalico@...hat.com
Cc:	dlstevens@...ibm.com, jmorris@...ei.org, kaber@...sh.net,
	kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org, mmarek@...e.cz,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org,
	pekkas@...core.fi, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH v4 1/1] igmp: call ip_mc_clear_src() only when we have
 no users of ip_mc_list

From: Veaceslav Falico <vfalico@...hat.com>
Date: Tue, 24 May 2011 11:15:05 +0200

> In igmp_group_dropped() we call ip_mc_clear_src(), which resets the number
> of source filters per mulitcast. However, igmp_group_dropped() is also
> called on NETDEV_DOWN, NETDEV_PRE_TYPE_CHANGE and NETDEV_UNREGISTER, which
> means that the group might get added back on NETDEV_UP, NETDEV_REGISTER and
> NETDEV_POST_TYPE_CHANGE respectively, leaving us with broken source
> filters.
> 
> To fix that, we must clear the source filters only when there are no users
> in the ip_mc_list, i.e. in ip_mc_dec_group() and on device destroy.
> 
> Acked-by: David L Stevens <dlstevens@...ibm.com>
> Signed-off-by: Veaceslav Falico <vfalico@...hat.com>

Applied.
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