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    Subject[PATCH 3.2 082/102] ipv6: reallocate addrconf router for ipv6 address when lo device up
    3.2.64-rc1 review patch.  If anyone has any objections, please let me know.

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

    From: chenweilong <chenweilong@huawei.com>

    It fix the bug 67951 on bugzilla
    https://bugzilla.kernel.org/show_bug.cgi?id=67951

    The patch can't be applied directly, as it' used the function introduced
    by "commit 94e187c0" ip6_rt_put(), that patch can't be applied directly
    either.

    ====================

    From: Gao feng <gaofeng@cn.fujitsu.com>

    commit 33d99113b1102c2d2f8603b9ba72d89d915c13f5 upstream.

    This commit don't have a stable tag, but it fix the bug
    no reply after loopback down-up.It's very worthy to be
    applied to stable 3.4 kernels.

    The bug is 67951 on bugzilla
    https://bugzilla.kernel.org/show_bug.cgi?id=67951


    CC: Sabrina Dubroca <sd@queasysnail.net>
    CC: Hannes Frederic Sowa <hannes@stressinduktion.org>
    Reported-by: Weilong Chen <chenweilong@huawei.com>
    Signed-off-by: Weilong Chen <chenweilong@huawei.com>
    Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
    Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    [weilong: s/ip6_rt_put/dst_release]
    Signed-off-by: Chen Weilong <chenweilong@huawei.com>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    net/ipv6/addrconf.c | 14 ++++++++++++--
    1 file changed, 12 insertions(+), 2 deletions(-)

    --- a/net/ipv6/addrconf.c
    +++ b/net/ipv6/addrconf.c
    @@ -2443,8 +2443,18 @@ static void init_loopback(struct net_dev
    if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
    continue;

    - if (sp_ifa->rt)
    - continue;
    + if (sp_ifa->rt) {
    + /* This dst has been added to garbage list when
    + * lo device down, release this obsolete dst and
    + * reallocate a new router for ifa.
    + */
    + if (sp_ifa->rt->dst.obsolete > 0) {
    + dst_release(&sp_ifa->rt->dst);
    + sp_ifa->rt = NULL;
    + } else {
    + continue;
    + }
    + }

    sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);



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