From: huaibin Wang <huaibin.wang@6wind.com>
Date: Tue, 25 Aug 2015 14:20:34 +0000 (+0200)
Subject: ip6_gre: release cached dst on tunnel removal
X-Git-Tag: v3.10.90~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d8c190531d0020870b93eee6a3933cb39fb1f52;p=thirdparty%2Fkernel%2Fstable.git

ip6_gre: release cached dst on tunnel removal

[ Upstream commit d4257295ba1b389c693b79de857a96e4b7cd8ac0 ]

When a tunnel is deleted, the cached dst entry should be released.

This problem may prevent the removal of a netns (seen with a x-netns IPv6
gre tunnel):
  unregister_netdevice: waiting for lo to become free. Usage count = 3

CC: Dmitry Kozlov <xeb@mail.ru>
Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
Signed-off-by: huaibin Wang <huaibin.wang@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 65156a73b3f3b..bf6233cdb7532 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -359,6 +359,7 @@ static void ip6gre_tunnel_uninit(struct net_device *dev)
 	struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 
 	ip6gre_tunnel_unlink(ign, netdev_priv(dev));
+	ip6_tnl_dst_reset(netdev_priv(dev));
 	dev_put(dev);
 }