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    Subject[PATCH 3.14 63/84] ip6_gre: release cached dst on tunnel removal
    Date
    3.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: huaibin Wang <huaibin.wang@6wind.com>

    [ 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>
    ---
    net/ipv6/ip6_gre.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/net/ipv6/ip6_gre.c
    +++ b/net/ipv6/ip6_gre.c
    @@ -357,6 +357,7 @@ static void ip6gre_tunnel_uninit(struct
    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);
    }




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