batman-adv: Add lockdep assert for container_list_lock

The batadv_tvlv_container* functions state in their kernel-doc that they
require tvlv.container_list_lock. Add an assert to automatically detect
when this might have been ignored by the caller.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>

net/batman-adv/main.c

@@ -697,6 +697,8 @@ static struct batadv_tvlv_container
 {
 	struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
 
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
 	hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
 		if (tvlv_tmp->tvlv_hdr.type != type)
 			continue;
@@ -729,6 +731,8 @@ static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
 	struct batadv_tvlv_container *tvlv;
 	u16 tvlv_len = 0;
 
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
 	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
 		tvlv_len += sizeof(struct batadv_tvlv_hdr);
 		tvlv_len += ntohs(tvlv->tvlv_hdr.len);