From: Salam Noureddine <noureddine@aristanetworks.com>
Date: Sun, 29 Sep 2013 20:41:34 +0000 (-0700)
Subject: ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put
X-Git-Tag: v3.2.52~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=765844f8edd831563fc646c7f747abf89eef4d4d;p=pandora-kernel.git

ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put

[ Upstream commit 9260d3e1013701aa814d10c8fc6a9f92bd17d643 ]

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@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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