2 files changed, 8 insertions, 0 deletions

diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c
index 7b49e4001778..9194f4d891b1 100644
--- a/net/batman-adv/hash.c
+++ b/net/batman-adv/hash.c
@@ -32,6 +32,8 @@ static void batadv_hash_init(struct batadv_hashtable *hash)
                 INIT_HLIST_HEAD(&hash->table[i]);
                 spin_lock_init(&hash->list_locks[i]);
         }
+
+        atomic_set(&hash->generation, 0);
 }
 
 /**
diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h
index 9490a7ca2ba6..0e36fa1c7c3e 100644
--- a/net/batman-adv/hash.h
+++ b/net/batman-adv/hash.h
@@ -21,6 +21,7 @@
 
 #include "main.h"
 
+#include <linux/atomic.h>
 #include <linux/compiler.h>
 #include <linux/list.h>
 #include <linux/rculist.h>
@@ -58,6 +59,9 @@ struct batadv_hashtable {
 
         /** @size: size of hashtable */
         u32 size;
+
+        /** @generation: current (generation) sequence number */
+        atomic_t generation;
 };
 
 /* allocates and clears the hash */
@@ -112,6 +116,7 @@ static inline int batadv_hash_add(struct batadv_hashtable *hash,
 
         /* no duplicate found in list, add new element */
         hlist_add_head_rcu(data_node, head);
+        atomic_inc(&hash->generation);
 
         ret = 0;
 
@@ -154,6 +159,7 @@ static inline void *batadv_hash_remove(struct batadv_hashtable *hash,
 
                 data_save = node;
                 hlist_del_rcu(node);
+                atomic_inc(&hash->generation);
                 break;
         }
         spin_unlock_bh(&hash->list_locks[index]);