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authorAntonio Quartulli <ordex@autistici.org>2011-07-10 02:36:36 +0400
committerMarek Lindner <lindner_marek@yahoo.de>2011-08-22 17:16:19 +0400
commit1a1f37d9257a4792ca17b28b1c2e4ad15fe95b28 (patch)
tree5bc0aa0d34b87d1f9b70682f1c54298860ce7d13 /net/batman-adv
parent322a8b034003c0d46d39af85bf24fee27b902f48 (diff)
downloadlinux-1a1f37d9257a4792ca17b28b1c2e4ad15fe95b28.tar.xz
batman-adv: hash_add() has to discriminate on the return value
hash_add() returns 0 on success while returns -1 either on error and on entry already present. The caller could use such information to select its behaviour. For this reason it is useful that hash_add() returns -1 in case on error and returns 1 in case of entry already present. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/hash.h25
-rw-r--r--net/batman-adv/originator.c2
-rw-r--r--net/batman-adv/vis.c4
3 files changed, 22 insertions, 9 deletions
diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h
index dd5c9fd7a905..d20aa71ba1e8 100644
--- a/net/batman-adv/hash.h
+++ b/net/batman-adv/hash.h
@@ -76,19 +76,30 @@ static inline void hash_delete(struct hashtable_t *hash,
hash_destroy(hash);
}
-/* adds data to the hashtable. returns 0 on success, -1 on error */
+/**
+ * hash_add - adds data to the hashtable
+ * @hash: storage hash table
+ * @compare: callback to determine if 2 hash elements are identical
+ * @choose: callback calculating the hash index
+ * @data: data passed to the aforementioned callbacks as argument
+ * @data_node: to be added element
+ *
+ * Returns 0 on success, 1 if the element already is in the hash
+ * and -1 on error.
+ */
+
static inline int hash_add(struct hashtable_t *hash,
hashdata_compare_cb compare,
hashdata_choose_cb choose,
const void *data, struct hlist_node *data_node)
{
- int index;
+ int index, ret = -1;
struct hlist_head *head;
struct hlist_node *node;
spinlock_t *list_lock; /* spinlock to protect write access */
if (!hash)
- goto err;
+ goto out;
index = choose(data, hash->size);
head = &hash->table[index];
@@ -99,6 +110,7 @@ static inline int hash_add(struct hashtable_t *hash,
if (!compare(node, data))
continue;
+ ret = 1;
goto err_unlock;
}
rcu_read_unlock();
@@ -108,12 +120,13 @@ static inline int hash_add(struct hashtable_t *hash,
hlist_add_head_rcu(data_node, head);
spin_unlock_bh(list_lock);
- return 0;
+ ret = 0;
+ goto out;
err_unlock:
rcu_read_unlock();
-err:
- return -1;
+out:
+ return ret;
}
/* removes data from hash, if found. returns pointer do data on success, so you
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index f3c3f620d195..d448018e514f 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -252,7 +252,7 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, const uint8_t *addr)
hash_added = hash_add(bat_priv->orig_hash, compare_orig,
choose_orig, orig_node, &orig_node->hash_entry);
- if (hash_added < 0)
+ if (hash_added != 0)
goto free_bcast_own_sum;
return orig_node;
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index 8a1b98589d76..8b75cc562053 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -465,7 +465,7 @@ static struct vis_info *add_packet(struct bat_priv *bat_priv,
/* try to add it */
hash_added = hash_add(bat_priv->vis_hash, vis_info_cmp, vis_info_choose,
info, &info->hash_entry);
- if (hash_added < 0) {
+ if (hash_added != 0) {
/* did not work (for some reason) */
kref_put(&info->refcount, free_info);
info = NULL;
@@ -920,7 +920,7 @@ int vis_init(struct bat_priv *bat_priv)
hash_added = hash_add(bat_priv->vis_hash, vis_info_cmp, vis_info_choose,
bat_priv->my_vis_info,
&bat_priv->my_vis_info->hash_entry);
- if (hash_added < 0) {
+ if (hash_added != 0) {
pr_err("Can't add own vis packet into hash\n");
/* not in hash, need to remove it manually. */
kref_put(&bat_priv->my_vis_info->refcount, free_info);