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kernel/linux-imx6_3.14.28/net/batman-adv/hash.c 1.82 KB
6b13f685e   김민수   BSP 최초 추가
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  /* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors:
   *
   * Simon Wunderlich, Marek Lindner
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, see <http://www.gnu.org/licenses/>.
   */
  
  #include "main.h"
  #include "hash.h"
  
  /* clears the hash */
  static void batadv_hash_init(struct batadv_hashtable *hash)
  {
  	uint32_t i;
  
  	for (i = 0; i < hash->size; i++) {
  		INIT_HLIST_HEAD(&hash->table[i]);
  		spin_lock_init(&hash->list_locks[i]);
  	}
  }
  
  /* free only the hashtable and the hash itself. */
  void batadv_hash_destroy(struct batadv_hashtable *hash)
  {
  	kfree(hash->list_locks);
  	kfree(hash->table);
  	kfree(hash);
  }
  
  /* allocates and clears the hash */
  struct batadv_hashtable *batadv_hash_new(uint32_t size)
  {
  	struct batadv_hashtable *hash;
  
  	hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
  	if (!hash)
  		return NULL;
  
  	hash->table = kmalloc(sizeof(*hash->table) * size, GFP_ATOMIC);
  	if (!hash->table)
  		goto free_hash;
  
  	hash->list_locks = kmalloc(sizeof(*hash->list_locks) * size,
  				   GFP_ATOMIC);
  	if (!hash->list_locks)
  		goto free_table;
  
  	hash->size = size;
  	batadv_hash_init(hash);
  	return hash;
  
  free_table:
  	kfree(hash->table);
  free_hash:
  	kfree(hash);
  	return NULL;
  }
  
  void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
  				struct lock_class_key *key)
  {
  	uint32_t i;
  
  	for (i = 0; i < hash->size; i++)
  		lockdep_set_class(&hash->list_locks[i], key);
  }