net/batman-adv/hash.c

   1 /* Copyright (C) 2006-2013 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, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "hash.h"
  22
  23 /* clears the hash */
  24 static void batadv_hash_init(struct batadv_hashtable *hash)
  25 {
  26         uint32_t i;
  27
  28         for (i = 0; i < hash->size; i++) {
  29                 INIT_HLIST_HEAD(&hash->table[i]);
  30                 spin_lock_init(&hash->list_locks[i]);
  31         }
  32 }
  33
  34 /* free only the hashtable and the hash itself. */
  35 void batadv_hash_destroy(struct batadv_hashtable *hash)
  36 {
  37         kfree(hash->list_locks);
  38         kfree(hash->table);
  39         kfree(hash);
  40 }
  41
  42 /* allocates and clears the hash */
  43 struct batadv_hashtable *batadv_hash_new(uint32_t size)
  44 {
  45         struct batadv_hashtable *hash;
  46
  47         hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
  48         if (!hash)
  49                 return NULL;
  50
  51         hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
  52         if (!hash->table)
  53                 goto free_hash;
  54
  55         hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
  56                                    GFP_ATOMIC);
  57         if (!hash->list_locks)
  58                 goto free_table;
  59
  60         hash->size = size;
  61         batadv_hash_init(hash);
  62         return hash;
  63
  64 free_table:
  65         kfree(hash->table);
  66 free_hash:
  67         kfree(hash);
  68         return NULL;
  69 }
  70
  71 void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
  72                                 struct lock_class_key *key)
  73 {
  74         uint32_t i;
  75
  76         for (i = 0; i < hash->size; i++)
  77                 lockdep_set_class(&hash->list_locks[i], key);
  78 }