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    Subject[patch 069/101] Dont add anycast reference to device multiple times
    From: Michal Wrobel <xmxwx@asn.pl>

    [IPV6]: anycast refcnt fix

    This patch fixes a bug in Linux IPv6 stack which caused anycast address
    to be added to a device prior DAD has been completed. This led to
    incorrect reference count which resulted in infinite wait for
    unregister_netdevice completion on interface removal.

    Signed-off-by: Michal Wrobel <xmxwx@asn.pl>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    net/ipv6/addrconf.c | 2 ++
    1 file changed, 2 insertions(+)

    --- linux-2.6.20.1.orig/net/ipv6/addrconf.c
    +++ linux-2.6.20.1/net/ipv6/addrconf.c
    @@ -469,6 +469,8 @@ static void dev_forward_change(struct in
    ipv6_dev_mc_dec(dev, &addr);
    }
    for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
    + if (ifa->flags&IFA_F_TENTATIVE)
    + continue;
    if (idev->cnf.forwarding)
    addrconf_join_anycast(ifa);
    else
    --
    -
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