blob: 5dfa610e4471887c1c1570a61cd921c6493372de [file] [log] [blame]
Takashi Iwai71fc4c72015-03-03 17:33:10 +01001/*
2 * generic arrays
3 */
4
5#include <linux/slab.h>
6#include <sound/core.h>
7#include <sound/hdaudio.h>
8
9/**
10 * snd_array_new - get a new element from the given array
11 * @array: the array object
12 *
13 * Get a new element from the given array. If it exceeds the
14 * pre-allocated array size, re-allocate the array.
15 *
16 * Returns NULL if allocation failed.
17 */
18void *snd_array_new(struct snd_array *array)
19{
20 if (snd_BUG_ON(!array->elem_size))
21 return NULL;
22 if (array->used >= array->alloced) {
23 int num = array->alloced + array->alloc_align;
Takashi Iwai33baefe2016-08-03 15:13:00 +020024 int oldsize = array->alloced * array->elem_size;
Takashi Iwai71fc4c72015-03-03 17:33:10 +010025 int size = (num + 1) * array->elem_size;
26 void *nlist;
27 if (snd_BUG_ON(num >= 4096))
28 return NULL;
Takashi Iwai33baefe2016-08-03 15:13:00 +020029 nlist = krealloc(array->list, size, GFP_KERNEL);
Takashi Iwai71fc4c72015-03-03 17:33:10 +010030 if (!nlist)
31 return NULL;
Takashi Iwai33baefe2016-08-03 15:13:00 +020032 memset(nlist + oldsize, 0, size - oldsize);
Takashi Iwai71fc4c72015-03-03 17:33:10 +010033 array->list = nlist;
34 array->alloced = num;
35 }
36 return snd_array_elem(array, array->used++);
37}
38EXPORT_SYMBOL_GPL(snd_array_new);
39
40/**
41 * snd_array_free - free the given array elements
42 * @array: the array object
43 */
44void snd_array_free(struct snd_array *array)
45{
46 kfree(array->list);
47 array->used = 0;
48 array->alloced = 0;
49 array->list = NULL;
50}
51EXPORT_SYMBOL_GPL(snd_array_free);