1 files changed, 13 insertions, 6 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 63a808d5af15..045597b9a7c0 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -179,7 +179,7 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 static void addrconf_dad_work(struct work_struct *w);
 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
                                    bool send_na);
-static void addrconf_dad_run(struct inet6_dev *idev);
+static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 static void addrconf_rs_timer(struct timer_list *t);
 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
@@ -3439,6 +3439,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                            void *ptr)
 {
         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+        struct netdev_notifier_change_info *change_info;
         struct netdev_notifier_changeupper_info *info;
         struct inet6_dev *idev = __in6_dev_get(dev);
         struct net *net = dev_net(dev);
@@ -3513,7 +3514,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                                 break;
                         }
 
-                        if (idev) {
+                        if (!IS_ERR_OR_NULL(idev)) {
                                 if (idev->if_flags & IF_READY) {
                                         /* device is already configured -
                                          * but resend MLD reports, we might
@@ -3521,6 +3522,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                                          * multicast snooping switches
                                          */
                                         ipv6_mc_up(idev);
+                                        change_info = ptr;
+                                        if (change_info->flags_changed & IFF_NOARP)
+                                                addrconf_dad_run(idev, true);
                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
                                         break;
                                 }
@@ -3555,7 +3559,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 
                 if (!IS_ERR_OR_NULL(idev)) {
                         if (run_pending)
-                                addrconf_dad_run(idev);
+                                addrconf_dad_run(idev, false);
 
                         /* Device has an address by now */
                         rt6_sync_up(dev, RTNH_F_DEAD);
@@ -4173,16 +4177,19 @@ static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
                 addrconf_verify_rtnl();
 }
 
-static void addrconf_dad_run(struct inet6_dev *idev)
+static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
 {
         struct inet6_ifaddr *ifp;
 
         read_lock_bh(&idev->lock);
         list_for_each_entry(ifp, &idev->addr_list, if_list) {
                 spin_lock(&ifp->lock);
-                if (ifp->flags & IFA_F_TENTATIVE &&
-                    ifp->state == INET6_IFADDR_STATE_DAD)
+                if ((ifp->flags & IFA_F_TENTATIVE &&
+                     ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
+                        if (restart)
+                                ifp->state = INET6_IFADDR_STATE_PREDAD;
                         addrconf_dad_kick(ifp);
+                }
                 spin_unlock(&ifp->lock);
         }
         read_unlock_bh(&idev->lock);