net/batman-adv/hash.c

   1 /* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors:
   2  *
   3  * Simon Wunderlich, Marek Lindner
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "hash.h"
  20
  21 /* clears the hash */
  22 static void batadv_hash_init(struct batadv_hashtable *hash)
  23 {
  24         uint32_t i;
  25
  26         for (i = 0; i < hash->size; i++) {
  27                 INIT_HLIST_HEAD(&hash->table[i]);
  28                 spin_lock_init(&hash->list_locks[i]);
  29         }
  30 }
  31
  32 /* free only the hashtable and the hash itself. */
  33 void batadv_hash_destroy(struct batadv_hashtable *hash)
  34 {
  35         kfree(hash->list_locks);
  36         kfree(hash->table);
  37         kfree(hash);
  38 }
  39
  40 /* allocates and clears the hash */
  41 struct batadv_hashtable *batadv_hash_new(uint32_t size)
  42 {
  43         struct batadv_hashtable *hash;
  44
  45         hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
  46         if (!hash)
  47                 return NULL;
  48
  49         hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
  50         if (!hash->table)
  51                 goto free_hash;
  52
  53         hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
  54                                    GFP_ATOMIC);
  55         if (!hash->list_locks)
  56                 goto free_table;
  57
  58         hash->size = size;
  59         batadv_hash_init(hash);
  60         return hash;
  61
  62 free_table:
  63         kfree(hash->table);
  64 free_hash:
  65         kfree(hash);
  66         return NULL;
  67 }
  68
  69 void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
  70                                 struct lock_class_key *key)
  71 {
  72         uint32_t i;
  73
  74         for (i = 0; i < hash->size; i++)
  75                 lockdep_set_class(&hash->list_locks[i], key);
  76 }