1 files changed, 3 insertions, 3 deletions

diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h
index 434822b2747..dd5c9fd7a90 100644
--- a/net/batman-adv/hash.h
+++ b/net/batman-adv/hash.h
@@ -28,12 +28,12 @@
  * compare 2 element datas for their keys,
  * return 0 if same and not 0 if not
  * same */
-typedef int (*hashdata_compare_cb)(struct hlist_node *, void *);
+typedef int (*hashdata_compare_cb)(const struct hlist_node *, const void *);
 
 /* the hashfunction, should return an index
  * based on the key in the data of the first
  * argument and the size the second */
-typedef int (*hashdata_choose_cb)(void *, int);
+typedef int (*hashdata_choose_cb)(const void *, int);
 typedef void (*hashdata_free_cb)(struct hlist_node *, void *);
 
 struct hashtable_t {
@@ -80,7 +80,7 @@ static inline void hash_delete(struct hashtable_t *hash,
 static inline int hash_add(struct hashtable_t *hash,
                            hashdata_compare_cb compare,
                            hashdata_choose_cb choose,
-                           void *data, struct hlist_node *data_node)
+                           const void *data, struct hlist_node *data_node)
 {
         int index;
         struct hlist_head *head;