1 files changed, 61 insertions, 46 deletions

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index b3058e46ee6b..dfbfccc9fe40 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -31,9 +31,6 @@
 
 #include <linux/if_arp.h>
 
-/* protect update critical side of hardif_list - but not the content */
-static DEFINE_SPINLOCK(hardif_list_lock);
-
 
 static int batman_skb_recv(struct sk_buff *skb,
                            struct net_device *dev,
@@ -110,47 +107,57 @@ out:
         return hard_iface;
 }
 
-static void update_primary_addr(struct bat_priv *bat_priv)
+static void primary_if_update_addr(struct bat_priv *bat_priv)
 {
         struct vis_packet *vis_packet;
+        struct hard_iface *primary_if;
+
+        primary_if = primary_if_get_selected(bat_priv);
+        if (!primary_if)
+                goto out;
 
         vis_packet = (struct vis_packet *)
                                 bat_priv->my_vis_info->skb_packet->data;
-        memcpy(vis_packet->vis_orig,
-               bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+        memcpy(vis_packet->vis_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
         memcpy(vis_packet->sender_orig,
-               bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+               primary_if->net_dev->dev_addr, ETH_ALEN);
+
+out:
+        if (primary_if)
+                hardif_free_ref(primary_if);
 }
 
-static void set_primary_if(struct bat_priv *bat_priv,
-                           struct hard_iface *hard_iface)
+static void primary_if_select(struct bat_priv *bat_priv,
+                              struct hard_iface *new_hard_iface)
 {
+        struct hard_iface *curr_hard_iface;
         struct batman_packet *batman_packet;
-        struct hard_iface *old_if;
 
-        if (hard_iface && !atomic_inc_not_zero(&hard_iface->refcount))
-                hard_iface = NULL;
+        ASSERT_RTNL();
+
+        if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount))
+                new_hard_iface = NULL;
 
-        old_if = bat_priv->primary_if;
-        bat_priv->primary_if = hard_iface;
+        curr_hard_iface = bat_priv->primary_if;
+        rcu_assign_pointer(bat_priv->primary_if, new_hard_iface);
 
-        if (old_if)
-                hardif_free_ref(old_if);
+        if (curr_hard_iface)
+                hardif_free_ref(curr_hard_iface);
 
-        if (!bat_priv->primary_if)
+        if (!new_hard_iface)
                 return;
 
-        batman_packet = (struct batman_packet *)(hard_iface->packet_buff);
+        batman_packet = (struct batman_packet *)(new_hard_iface->packet_buff);
         batman_packet->flags = PRIMARIES_FIRST_HOP;
         batman_packet->ttl = TTL;
 
-        update_primary_addr(bat_priv);
+        primary_if_update_addr(bat_priv);
 
         /***
-         * hacky trick to make sure that we send the HNA information via
+         * hacky trick to make sure that we send the TT information via
          * our new primary interface
          */
-        atomic_set(&bat_priv->hna_local_changed, 1);
+        atomic_set(&bat_priv->tt_local_changed, 1);
 }
 
 static bool hardif_is_iface_up(struct hard_iface *hard_iface)
@@ -236,9 +243,10 @@ void update_min_mtu(struct net_device *soft_iface)
 static void hardif_activate_interface(struct hard_iface *hard_iface)
 {
         struct bat_priv *bat_priv;
+        struct hard_iface *primary_if = NULL;
 
         if (hard_iface->if_status != IF_INACTIVE)
-                return;
+                goto out;
 
         bat_priv = netdev_priv(hard_iface->soft_iface);
 
@@ -249,14 +257,18 @@ static void hardif_activate_interface(struct hard_iface *hard_iface)
          * the first active interface becomes our primary interface or
          * the next active interface after the old primay interface was removed
          */
-        if (!bat_priv->primary_if)
-                set_primary_if(bat_priv, hard_iface);
+        primary_if = primary_if_get_selected(bat_priv);
+        if (!primary_if)
+                primary_if_select(bat_priv, hard_iface);
 
         bat_info(hard_iface->soft_iface, "Interface activated: %s\n",
                  hard_iface->net_dev->name);
 
         update_min_mtu(hard_iface->soft_iface);
-        return;
+
+out:
+        if (primary_if)
+                hardif_free_ref(primary_if);
 }
 
 static void hardif_deactivate_interface(struct hard_iface *hard_iface)
@@ -327,7 +339,7 @@ int hardif_enable_interface(struct hard_iface *hard_iface, char *iface_name)
         batman_packet->flags = 0;
         batman_packet->ttl = 2;
         batman_packet->tq = TQ_MAX_VALUE;
-        batman_packet->num_hna = 0;
+        batman_packet->num_tt = 0;
 
         hard_iface->if_num = bat_priv->num_ifaces;
         bat_priv->num_ifaces++;
@@ -386,12 +398,13 @@ err:
 void hardif_disable_interface(struct hard_iface *hard_iface)
 {
         struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
+        struct hard_iface *primary_if = NULL;
 
         if (hard_iface->if_status == IF_ACTIVE)
                 hardif_deactivate_interface(hard_iface);
 
         if (hard_iface->if_status != IF_INACTIVE)
-                return;
+                goto out;
 
         bat_info(hard_iface->soft_iface, "Removing interface: %s\n",
                  hard_iface->net_dev->name);
@@ -400,11 +413,12 @@ void hardif_disable_interface(struct hard_iface *hard_iface)
         bat_priv->num_ifaces--;
         orig_hash_del_if(hard_iface, bat_priv->num_ifaces);
 
-        if (hard_iface == bat_priv->primary_if) {
+        primary_if = primary_if_get_selected(bat_priv);
+        if (hard_iface == primary_if) {
                 struct hard_iface *new_if;
 
                 new_if = hardif_get_active(hard_iface->soft_iface);
-                set_primary_if(bat_priv, new_if);
+                primary_if_select(bat_priv, new_if);
 
                 if (new_if)
                         hardif_free_ref(new_if);
@@ -425,6 +439,10 @@ void hardif_disable_interface(struct hard_iface *hard_iface)
 
         hard_iface->soft_iface = NULL;
         hardif_free_ref(hard_iface);
+
+out:
+        if (primary_if)
+                hardif_free_ref(primary_if);
 }
 
 static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
@@ -432,6 +450,8 @@ static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
         struct hard_iface *hard_iface;
         int ret;
 
+        ASSERT_RTNL();
+
         ret = is_valid_iface(net_dev);
         if (ret != 1)
                 goto out;
@@ -458,10 +478,7 @@ static struct hard_iface *hardif_add_interface(struct net_device *net_dev)
         atomic_set(&hard_iface->refcount, 2);
 
         check_known_mac_addr(hard_iface->net_dev);
-
-        spin_lock(&hardif_list_lock);
         list_add_tail_rcu(&hard_iface->list, &hardif_list);
-        spin_unlock(&hardif_list_lock);
 
         return hard_iface;
 
@@ -475,6 +492,8 @@ out:
 
 static void hardif_remove_interface(struct hard_iface *hard_iface)
 {
+        ASSERT_RTNL();
+
         /* first deactivate interface */
         if (hard_iface->if_status != IF_NOT_IN_USE)
                 hardif_disable_interface(hard_iface);
@@ -490,20 +509,11 @@ static void hardif_remove_interface(struct hard_iface *hard_iface)
 void hardif_remove_interfaces(void)
 {
         struct hard_iface *hard_iface, *hard_iface_tmp;
-        struct list_head if_queue;
-
-        INIT_LIST_HEAD(&if_queue);
 
-        spin_lock(&hardif_list_lock);
+        rtnl_lock();
         list_for_each_entry_safe(hard_iface, hard_iface_tmp,
                                  &hardif_list, list) {
                 list_del_rcu(&hard_iface->list);
-                list_add_tail(&hard_iface->list, &if_queue);
-        }
-        spin_unlock(&hardif_list_lock);
-
-        rtnl_lock();
-        list_for_each_entry_safe(hard_iface, hard_iface_tmp, &if_queue, list) {
                 hardif_remove_interface(hard_iface);
         }
         rtnl_unlock();
@@ -514,6 +524,7 @@ static int hard_if_event(struct notifier_block *this,
 {
         struct net_device *net_dev = (struct net_device *)ptr;
         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
+        struct hard_iface *primary_if = NULL;
         struct bat_priv *bat_priv;
 
         if (!hard_iface && event == NETDEV_REGISTER)
@@ -531,9 +542,7 @@ static int hard_if_event(struct notifier_block *this,
                 hardif_deactivate_interface(hard_iface);
                 break;
         case NETDEV_UNREGISTER:
-                spin_lock(&hardif_list_lock);
                 list_del_rcu(&hard_iface->list);
-                spin_unlock(&hardif_list_lock);
 
                 hardif_remove_interface(hard_iface);
                 break;
@@ -549,8 +558,12 @@ static int hard_if_event(struct notifier_block *this,
                 update_mac_addresses(hard_iface);
 
                 bat_priv = netdev_priv(hard_iface->soft_iface);
-                if (hard_iface == bat_priv->primary_if)
-                        update_primary_addr(bat_priv);
+                primary_if = primary_if_get_selected(bat_priv);
+                if (!primary_if)
+                        goto hardif_put;
+
+                if (hard_iface == primary_if)
+                        primary_if_update_addr(bat_priv);
                 break;
         default:
                 break;
@@ -559,6 +572,8 @@ static int hard_if_event(struct notifier_block *this,
 hardif_put:
         hardif_free_ref(hard_iface);
 out:
+        if (primary_if)
+                hardif_free_ref(primary_if);
         return NOTIFY_DONE;
 }