batman-adv: set up network coding packet handlers during module init

batman-adv saves its table of packet handlers as a global state, so handlers
must be set up only once (and setting them up a second time will fail).

The recently-added network coding support tries to set up its handler each time
a new softif is registered, which obviously fails when more that one softif is
used (and in consequence, the softif creation fails).

Fix this by splitting up batadv_nc_init into batadv_nc_init (which is called
only once) and batadv_nc_mesh_init (which is called for each softif); in
addition batadv_nc_free is renamed to batadv_nc_mesh_free to keep naming
consistent.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

3 files changed, 31 insertions, 16 deletions

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index c72d1bcdcf49..1356af660b5b 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -65,6 +65,7 @@ static int __init batadv_init(void)
         batadv_recv_handler_init();
 
         batadv_iv_init();
+        batadv_nc_init();
 
         batadv_event_workqueue = create_singlethread_workqueue("bat_events");
 
@@ -142,7 +143,7 @@ int batadv_mesh_init(struct net_device *soft_iface)
         if (ret < 0)
                 goto err;
 
-        ret = batadv_nc_init(bat_priv);
+        ret = batadv_nc_mesh_init(bat_priv);
         if (ret < 0)
                 goto err;
 
@@ -167,7 +168,7 @@ void batadv_mesh_free(struct net_device *soft_iface)
         batadv_vis_quit(bat_priv);
 
         batadv_gw_node_purge(bat_priv);
-        batadv_nc_free(bat_priv);
+        batadv_nc_mesh_free(bat_priv);
         batadv_dat_free(bat_priv);
         batadv_bla_free(bat_priv);
 
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index a487d46e0aec..4ecc0b6bf8ab 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -35,6 +35,20 @@ static int batadv_nc_recv_coded_packet(struct sk_buff *skb,
                                        struct batadv_hard_iface *recv_if);
 
 /**
+ * batadv_nc_init - one-time initialization for network coding
+ */
+int __init batadv_nc_init(void)
+{
+        int ret;
+
+        /* Register our packet type */
+        ret = batadv_recv_handler_register(BATADV_CODED,
+                                           batadv_nc_recv_coded_packet);
+
+        return ret;
+}
+
+/**
  * batadv_nc_start_timer - initialise the nc periodic worker
  * @bat_priv: the bat priv with all the soft interface information
  */
@@ -45,10 +59,10 @@ static void batadv_nc_start_timer(struct batadv_priv *bat_priv)
 }
 
 /**
- * batadv_nc_init - initialise coding hash table and start house keeping
+ * batadv_nc_mesh_init - initialise coding hash table and start house keeping
  * @bat_priv: the bat priv with all the soft interface information
  */
-int batadv_nc_init(struct batadv_priv *bat_priv)
+int batadv_nc_mesh_init(struct batadv_priv *bat_priv)
 {
         bat_priv->nc.timestamp_fwd_flush = jiffies;
         bat_priv->nc.timestamp_sniffed_purge = jiffies;
@@ -70,11 +84,6 @@ int batadv_nc_init(struct batadv_priv *bat_priv)
         batadv_hash_set_lock_class(bat_priv->nc.coding_hash,
                                    &batadv_nc_decoding_hash_lock_class_key);
 
-        /* Register our packet type */
-        if (batadv_recv_handler_register(BATADV_CODED,
-                                         batadv_nc_recv_coded_packet) < 0)
-                goto err;
-
         INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker);
         batadv_nc_start_timer(bat_priv);
 
@@ -1721,12 +1730,11 @@ free_nc_packet:
 }
 
 /**
- * batadv_nc_free - clean up network coding memory
+ * batadv_nc_mesh_free - clean up network coding memory
  * @bat_priv: the bat priv with all the soft interface information
  */
-void batadv_nc_free(struct batadv_priv *bat_priv)
+void batadv_nc_mesh_free(struct batadv_priv *bat_priv)
 {
-        batadv_recv_handler_unregister(BATADV_CODED);
         cancel_delayed_work_sync(&bat_priv->nc.work);
 
         batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL);
diff --git a/net/batman-adv/network-coding.h b/net/batman-adv/network-coding.h
index 85a4ec81ad50..ddfa618e80bf 100644
--- a/net/batman-adv/network-coding.h
+++ b/net/batman-adv/network-coding.h
@@ -22,8 +22,9 @@
 
 #ifdef CONFIG_BATMAN_ADV_NC
 
-int batadv_nc_init(struct batadv_priv *bat_priv);
-void batadv_nc_free(struct batadv_priv *bat_priv);
+int batadv_nc_init(void);
+int batadv_nc_mesh_init(struct batadv_priv *bat_priv);
+void batadv_nc_mesh_free(struct batadv_priv *bat_priv);
 void batadv_nc_update_nc_node(struct batadv_priv *bat_priv,
                               struct batadv_orig_node *orig_node,
                               struct batadv_orig_node *orig_neigh_node,
@@ -46,12 +47,17 @@ int batadv_nc_init_debugfs(struct batadv_priv *bat_priv);
 
 #else /* ifdef CONFIG_BATMAN_ADV_NC */
 
-static inline int batadv_nc_init(struct batadv_priv *bat_priv)
+static inline int batadv_nc_init(void)
 {
         return 0;
 }
 
-static inline void batadv_nc_free(struct batadv_priv *bat_priv)
+static inline int batadv_nc_mesh_init(struct batadv_priv *bat_priv)
+{
+        return 0;
+}
+
+static inline void batadv_nc_mesh_free(struct batadv_priv *bat_priv)
 {
         return;
 }