IPv6: keep tentative addresses in hash table

When link goes down, want address to be preserved but in a tentative
state, therefore it has to stay in hash list.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 7 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a9913d23f7c7..9d78c1229497 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2704,17 +2704,18 @@ static int addrconf_ifdown(struct net_device *dev, int how)
                         /* Flag it for later restoration when link comes up */
                         ifa->flags |= IFA_F_TENTATIVE;
                         in6_ifa_hold(ifa);
+                        write_unlock_bh(&idev->lock);
                 } else {
                         list_del(&ifa->if_list);
                         ifa->dead = 1;
-                }
-                write_unlock_bh(&idev->lock);
+                        write_unlock_bh(&idev->lock);
 
-                /* clear hash table */
-                spin_lock_bh(&addrconf_hash_lock);
-                hlist_del_init_rcu(&ifa->addr_lst);
-                __in6_ifa_put(ifa);
-                spin_unlock_bh(&addrconf_hash_lock);
+                        /* clear hash table */
+                        spin_lock_bh(&addrconf_hash_lock);
+                        hlist_del_init_rcu(&ifa->addr_lst);
+                        __in6_ifa_put(ifa);
+                        spin_unlock_bh(&addrconf_hash_lock);
+                }
 
                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);