LXR linux/net/batman-adv/hash.c

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (C) B.A.T.M.A.N. contributors:
   3 *
   4 * Simon Wunderlich, Marek Lindner
   5 */
   6
   7#include "hash.h"
   8#include "main.h"
   9
  10#include <linux/gfp.h>
  11#include <linux/lockdep.h>
  12#include <linux/slab.h>
  13
  14/* clears the hash */
  15static void batadv_hash_init(struct batadv_hashtable *hash)
  16{
  17        u32 i;
  18
  19        for (i = 0; i < hash->size; i++) {
  20                INIT_HLIST_HEAD(&hash->table[i]);
  21                spin_lock_init(&hash->list_locks[i]);
  22        }
  23
  24        atomic_set(&hash->generation, 0);
  25}
  26
  27/**
  28 * batadv_hash_destroy() - Free only the hashtable and the hash itself
  29 * @hash: hash object to destroy
  30 */
  31void batadv_hash_destroy(struct batadv_hashtable *hash)
  32{
  33        kfree(hash->list_locks);
  34        kfree(hash->table);
  35        kfree(hash);
  36}
  37
  38/**
  39 * batadv_hash_new() - Allocates and clears the hashtable
  40 * @size: number of hash buckets to allocate
  41 *
  42 * Return: newly allocated hashtable, NULL on errors
  43 */
  44struct batadv_hashtable *batadv_hash_new(u32 size)
  45{
  46        struct batadv_hashtable *hash;
  47
  48        hash = kmalloc(sizeof(*hash), GFP_ATOMIC);
  49        if (!hash)
  50                return NULL;
  51
  52        hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC);
  53        if (!hash->table)
  54                goto free_hash;
  55
  56        hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks),
  57                                         GFP_ATOMIC);
  58        if (!hash->list_locks)
  59                goto free_table;
  60
  61        hash->size = size;
  62        batadv_hash_init(hash);
  63        return hash;
  64
  65free_table:
  66        kfree(hash->table);
  67free_hash:
  68        kfree(hash);
  69        return NULL;
  70}
  71
  72/**
  73 * batadv_hash_set_lock_class() - Set specific lockdep class for hash spinlocks
  74 * @hash: hash object to modify
  75 * @key: lockdep class key address
  76 */
  77void batadv_hash_set_lock_class(struct batadv_hashtable *hash,
  78                                struct lock_class_key *key)
  79{
  80        u32 i;
  81
  82        for (i = 0; i < hash->size; i++)
  83                lockdep_set_class(&hash->list_locks[i], key);
  84}
  85