From: Veaceslav Falico <vfalico@redhat.com>
Date: Mon, 23 May 2011 23:15:05 +0000 (+0000)
Subject: igmp: call ip_mc_clear_src() only when we have no users of ip_mc_list
X-Git-Tag: v3.0-rc1~147^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24cf3af3fed5edcf90bc2a0ed181e6ce1513d2dc;p=pandora-kernel.git

igmp: call ip_mc_clear_src() only when we have no users of ip_mc_list

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@us.ibm.com>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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