batman-adv: Annotate deleting functions with external lock via lockdep
Functions which use (h)list_del* are requiring correct locking when they
operate on global lists. Most of the time the search in the list and the
delete are done in the same function. All other cases should have it
visible that they require a special lock to avoid race conditions.
Lockdep asserts can be used to check these problem during runtime when the
lockdep functionality is enabled.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index d277ba7..50fc07b 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -30,6 +30,7 @@
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/list.h>
+#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
@@ -737,13 +738,17 @@
/**
* batadv_tvlv_container_remove - remove tvlv container from the tvlv container
* list
+ * @bat_priv: the bat priv with all the soft interface information
* @tvlv: the to be removed tvlv container
*
* Has to be called with the appropriate locks being acquired
* (tvlv.container_list_lock).
*/
-static void batadv_tvlv_container_remove(struct batadv_tvlv_container *tvlv)
+static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
+ struct batadv_tvlv_container *tvlv)
{
+ lockdep_assert_held(&bat_priv->tvlv.handler_list_lock);
+
if (!tvlv)
return;
@@ -768,7 +773,7 @@
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
tvlv = batadv_tvlv_container_get(bat_priv, type, version);
- batadv_tvlv_container_remove(tvlv);
+ batadv_tvlv_container_remove(bat_priv, tvlv);
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
}
@@ -807,7 +812,7 @@
spin_lock_bh(&bat_priv->tvlv.container_list_lock);
tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
- batadv_tvlv_container_remove(tvlv_old);
+ batadv_tvlv_container_remove(bat_priv, tvlv_old);
hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
}