From: Salam Noureddine <noureddine@aristanetworks.com>
Date: Sun, 29 Sep 2013 20:39:42 +0000 (-0700)
Subject: ipv4 igmp: use in_dev_put in timer handlers instead of __in_dev_put
X-Git-Tag: v3.2.52~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=003efcca2ad3e471e9103688a715bd33e29cb37b;p=pandora-kernel.git

ipv4 igmp: use in_dev_put in timer handlers instead of __in_dev_put

[ Upstream commit e2401654dd0f5f3fb7a8d80dad9554d73d7ca394 ]

It is possible for the timer handlers to run after the call to
ip_mc_down so use in_dev_put instead of __in_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 in_device 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@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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