Merge tag 'sound-3.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...

[~andy/linux] / net / batman-adv / originator.c

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 6df12a2e36052b7f8a07dea276565c362890863f..853941629dc15a3c60b569d315815aee4987fe08 100644 (file)
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -457,6 +457,42 @@ out:
        return neigh_node;
 }
 
+/**
+ * batadv_neigh_node_get - retrieve a neighbour from the list
+ * @orig_node: originator which the neighbour belongs to
+ * @hard_iface: the interface where this neighbour is connected to
+ * @addr: the address of the neighbour
+ *
+ * Looks for and possibly returns a neighbour belonging to this originator list
+ * which is connected through the provided hard interface.
+ * Returns NULL if the neighbour is not found.
+ */
+struct batadv_neigh_node *
+batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
+                     const struct batadv_hard_iface *hard_iface,
+                     const uint8_t *addr)
+{
+       struct batadv_neigh_node *tmp_neigh_node, *res = NULL;
+
+       rcu_read_lock();
+       hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) {
+               if (!batadv_compare_eth(tmp_neigh_node->addr, addr))
+                       continue;
+
+               if (tmp_neigh_node->if_incoming != hard_iface)
+                       continue;
+
+               if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+                       continue;
+
+               res = tmp_neigh_node;
+               break;
+       }
+       rcu_read_unlock();
+
+       return res;
+}
+
 /**
  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
  * @rcu: rcu pointer of the orig_ifinfo object