From: Sabrina Dubroca <sd@queasysnail.net>
Date: Wed, 10 Sep 2014 21:23:02 +0000 (+0200)
Subject: ipv6: clean up anycast when an interface is destroyed
X-Git-Tag: fixes-for-v3.18-merge-window~87^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=381f4dca48d23e155b936b86ccd3ff12f073cf0f;p=pandora-kernel.git

ipv6: clean up anycast when an interface is destroyed

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@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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