ipv6: assign rt6_info to inet6_ifaddr in init_loopback

Commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f
"net IPv6 : Fix broken IPv6 routing table after loopback down-up"
forgot to assign rt6_info to the inet6_ifaddr.
When disable the net device, the rt6_info which allocated
in init_loopback will not be destroied in __ipv6_ifa_notify.

This will trigger the waring message below
[23527.916091] unregister_netdevice: waiting for tap0 to become free. Usage count = 1

Reported-by: Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d1b2d8034b54..1bbf744c2cc3 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2658,8 +2658,10 @@ static void init_loopback(struct net_device *dev)
                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
 
                         /* Failure cases are ignored */
-                        if (!IS_ERR(sp_rt))
+                        if (!IS_ERR(sp_rt)) {
+                                sp_ifa->rt = sp_rt;
                                 ip6_ins_rt(sp_rt);
+                        }
                 }
                 read_unlock_bh(&idev->lock);
         }