blob: 516795baa7db60ad37aec14d4886b4ce5da4f78d [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;
24 int size = (num + 1) * array->elem_size;
25 void *nlist;
26 if (snd_BUG_ON(num >= 4096))
27 return NULL;
28 nlist = krealloc(array->list, size, GFP_KERNEL | __GFP_ZERO);
29 if (!nlist)
30 return NULL;
31 array->list = nlist;
32 array->alloced = num;
33 }
34 return snd_array_elem(array, array->used++);
35}
36EXPORT_SYMBOL_GPL(snd_array_new);
37
38/**
39 * snd_array_free - free the given array elements
40 * @array: the array object
41 */
42void snd_array_free(struct snd_array *array)
43{
44 kfree(array->list);
45 array->used = 0;
46 array->alloced = 0;
47 array->list = NULL;
48}
49EXPORT_SYMBOL_GPL(snd_array_free);