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 --- hash.h | 9 ++++++--- originator.c | 2 +- vis.c | 4 ++-- 3 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/hash.h b/hash.h index dd5c9fd..864b9b0 100644 --- a/hash.h +++ b/hash.h @@ -82,7 +82,7 @@ static inline int hash_add(struct hashtable_t *hash, 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 */ @@ -98,6 +98,7 @@ static inline int hash_add(struct hashtable_t *hash, __hlist_for_each_rcu(node, head) { if (!compare(node, data)) continue; + ret = 1;
goto err_unlock; } @@ -108,12 +109,14 @@ 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; + + return ret;
err_unlock: rcu_read_unlock(); err: - return -1; + return ret; }
/* removes data from hash, if found. returns pointer do data on success, so you diff --git a/originator.c b/originator.c index f3c3f62..d448018 100644 --- a/originator.c +++ b/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/vis.c b/vis.c index 8a1b985..8b75cc5 100644 --- a/vis.c +++ b/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);