batman-adv: Move soft-interface initialization to ndo_init

The initialization of an net_device object should be done in the
init/constructor function and not from the outside after the register_netdevice
was done to avoid race conditions.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 368219e..da000e9 100644 (file)
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -563,6 +563,11 @@ static int batadv_hard_if_event(struct notifier_block *this,
        struct batadv_hard_iface *primary_if = NULL;
        struct batadv_priv *bat_priv;
 
+       if (batadv_softif_is_valid(net_dev) && event == NETDEV_REGISTER) {
+               batadv_sysfs_add_meshif(net_dev);
+               return NOTIFY_DONE;
+       }
+
        hard_iface = batadv_hardif_get_by_netdev(net_dev);
        if (!hard_iface && event == NETDEV_REGISTER)
                hard_iface = batadv_hardif_add_interface(net_dev);

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index f93ae42..c5cb0a7 100644 (file)
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -402,55 +402,6 @@ static void batadv_set_lockdep_class(struct net_device *dev)
 }
 
 /**
- * batadv_softif_init - Late stage initialization of soft interface
- * @dev: registered network device to modify
- *
- * Returns error code on failures
- */
-static int batadv_softif_init(struct net_device *dev)
-{
-       batadv_set_lockdep_class(dev);
-
-       return 0;
-}
-
-static const struct net_device_ops batadv_netdev_ops = {
-       .ndo_init = batadv_softif_init,
-       .ndo_open = batadv_interface_open,
-       .ndo_stop = batadv_interface_release,
-       .ndo_get_stats = batadv_interface_stats,
-       .ndo_set_mac_address = batadv_interface_set_mac_addr,
-       .ndo_change_mtu = batadv_interface_change_mtu,
-       .ndo_start_xmit = batadv_interface_tx,
-       .ndo_validate_addr = eth_validate_addr
-};
-
-static void batadv_interface_setup(struct net_device *dev)
-{
-       struct batadv_priv *priv = netdev_priv(dev);
-
-       ether_setup(dev);
-
-       dev->netdev_ops = &batadv_netdev_ops;
-       dev->destructor = free_netdev;
-       dev->tx_queue_len = 0;
-
-       /* can't call min_mtu, because the needed variables
-        * have not been initialized yet
-        */
-       dev->mtu = ETH_DATA_LEN;
-       /* reserve more space in the skbuff for our header */
-       dev->hard_header_len = BATADV_HEADER_LEN;
-
-       /* generate random address */
-       eth_hw_addr_random(dev);
-
-       SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
-
-       memset(priv, 0, sizeof(*priv));
-}
-
-/**
  * batadv_softif_destroy_finish - cleans up the remains of a softif
  * @work: work queue item
  *
@@ -474,21 +425,22 @@ static void batadv_softif_destroy_finish(struct work_struct *work)
        rtnl_unlock();
 }
 
-struct net_device *batadv_softif_create(const char *name)
+/**
+ * batadv_softif_init_late - late stage initialization of soft interface
+ * @dev: registered network device to modify
+ *
+ * Returns error code on failures
+ */
+static int batadv_softif_init_late(struct net_device *dev)
 {
-       struct net_device *soft_iface;
        struct batadv_priv *bat_priv;
        int ret;
        size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
 
-       soft_iface = alloc_netdev(sizeof(*bat_priv), name,
-                                 batadv_interface_setup);
-
-       if (!soft_iface)
-               goto out;
+       batadv_set_lockdep_class(dev);
 
-       bat_priv = netdev_priv(soft_iface);
-       bat_priv->soft_iface = soft_iface;
+       bat_priv = netdev_priv(dev);
+       bat_priv->soft_iface = dev;
        INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
 
        /* batadv_interface_stats() needs to be available as soon as
@@ -496,14 +448,7 @@ struct net_device *batadv_softif_create(const char *name)
         */
        bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
        if (!bat_priv->bat_counters)
-               goto free_soft_iface;
-
-       ret = register_netdevice(soft_iface);
-       if (ret < 0) {
-               pr_err("Unable to register the batman interface '%s': %i\n",
-                      name, ret);
-               goto free_bat_counters;
-       }
+               return -ENOMEM;
 
        atomic_set(&bat_priv->aggregated_ogms, 1);
        atomic_set(&bat_priv->bonding, 0);
@@ -541,41 +486,89 @@ struct net_device *batadv_softif_create(const char *name)
        bat_priv->primary_if = NULL;
        bat_priv->num_ifaces = 0;
 
-       ret = batadv_algo_select(bat_priv, batadv_routing_algo);
-       if (ret < 0)
-               goto unreg_soft_iface;
-
        batadv_nc_init_bat_priv(bat_priv);
 
-       ret = batadv_sysfs_add_meshif(soft_iface);
+       ret = batadv_algo_select(bat_priv, batadv_routing_algo);
        if (ret < 0)
-               goto unreg_soft_iface;
+               goto free_bat_counters;
 
-       ret = batadv_debugfs_add_meshif(soft_iface);
+       ret = batadv_debugfs_add_meshif(dev);
        if (ret < 0)
-               goto unreg_sysfs;
+               goto free_bat_counters;
 
-       ret = batadv_mesh_init(soft_iface);
+       ret = batadv_mesh_init(dev);
        if (ret < 0)
                goto unreg_debugfs;
 
-       return soft_iface;
+       return 0;
 
 unreg_debugfs:
-       batadv_debugfs_del_meshif(soft_iface);
-unreg_sysfs:
-       batadv_sysfs_del_meshif(soft_iface);
-unreg_soft_iface:
-       free_percpu(bat_priv->bat_counters);
-       unregister_netdevice(soft_iface);
-       return NULL;
-
+       batadv_debugfs_del_meshif(dev);
 free_bat_counters:
        free_percpu(bat_priv->bat_counters);
-free_soft_iface:
-       free_netdev(soft_iface);
-out:
-       return NULL;
+
+       return ret;
+}
+
+static const struct net_device_ops batadv_netdev_ops = {
+       .ndo_init = batadv_softif_init_late,
+       .ndo_open = batadv_interface_open,
+       .ndo_stop = batadv_interface_release,
+       .ndo_get_stats = batadv_interface_stats,
+       .ndo_set_mac_address = batadv_interface_set_mac_addr,
+       .ndo_change_mtu = batadv_interface_change_mtu,
+       .ndo_start_xmit = batadv_interface_tx,
+       .ndo_validate_addr = eth_validate_addr
+};
+
+/**
+ * batadv_softif_init_early - early stage initialization of soft interface
+ * @dev: registered network device to modify
+ */
+static void batadv_softif_init_early(struct net_device *dev)
+{
+       struct batadv_priv *priv = netdev_priv(dev);
+
+       ether_setup(dev);
+
+       dev->netdev_ops = &batadv_netdev_ops;
+       dev->destructor = free_netdev;
+       dev->tx_queue_len = 0;
+
+       /* can't call min_mtu, because the needed variables
+        * have not been initialized yet
+        */
+       dev->mtu = ETH_DATA_LEN;
+       /* reserve more space in the skbuff for our header */
+       dev->hard_header_len = BATADV_HEADER_LEN;
+
+       /* generate random address */
+       eth_hw_addr_random(dev);
+
+       SET_ETHTOOL_OPS(dev, &batadv_ethtool_ops);
+
+       memset(priv, 0, sizeof(*priv));
+}
+
+struct net_device *batadv_softif_create(const char *name)
+{
+       struct net_device *soft_iface;
+       int ret;
+
+       soft_iface = alloc_netdev(sizeof(struct batadv_priv), name,
+                                 batadv_softif_init_early);
+       if (!soft_iface)
+               return NULL;
+
+       ret = register_netdevice(soft_iface);
+       if (ret < 0) {
+               pr_err("Unable to register the batman interface '%s': %i\n",
+                      name, ret);
+               free_netdev(soft_iface);
+               return NULL;
+       }
+
+       return soft_iface;
 }
 
 void batadv_softif_destroy(struct net_device *soft_iface)