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

commit 6c519bad7b19a2c14a075b400edabaa630330123 upstream.

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>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthias Schiffer 2013-09-27 18:03:39 +02:00 committed by Greg Kroah-Hartman
parent 7e19d6db7c
commit b44cfec16d
3 changed files with 31 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/batman-adv/main.c
View File

@ -61,6 +61,7 @@ static int __init batadv_init(void)
batadv_recv_handler_init();
batadv_iv_init();
batadv_nc_init();
batadv_event_workqueue = create_singlethread_workqueue("bat_events");
@ -138,7 +139,7 @@ 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;
@ -163,7 +164,7 @@ 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);

28
net/batman-adv/network-coding.c
View File

@ -34,6 +34,20 @@ static void batadv_nc_worker(struct work_struct *work);
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);
@ -1722,12 +1731,11 @@ 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);

14
net/batman-adv/network-coding.h
View File

@ -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,
@ -47,12 +48,17 @@ 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;
}