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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
71fc4c7e TI |
2 | /* |
3 | * generic arrays | |
4 | */ | |
5 | ||
6 | #include <linux/slab.h> | |
7 | #include <sound/core.h> | |
8 | #include <sound/hdaudio.h> | |
9 | ||
10 | /** | |
11 | * snd_array_new - get a new element from the given array | |
12 | * @array: the array object | |
13 | * | |
14 | * Get a new element from the given array. If it exceeds the | |
15 | * pre-allocated array size, re-allocate the array. | |
16 | * | |
17 | * Returns NULL if allocation failed. | |
18 | */ | |
19 | void *snd_array_new(struct snd_array *array) | |
20 | { | |
21 | if (snd_BUG_ON(!array->elem_size)) | |
22 | return NULL; | |
23 | if (array->used >= array->alloced) { | |
24 | int num = array->alloced + array->alloc_align; | |
33baefe5 | 25 | int oldsize = array->alloced * array->elem_size; |
71fc4c7e TI |
26 | int size = (num + 1) * array->elem_size; |
27 | void *nlist; | |
28 | if (snd_BUG_ON(num >= 4096)) | |
29 | return NULL; | |
33baefe5 | 30 | nlist = krealloc(array->list, size, GFP_KERNEL); |
71fc4c7e TI |
31 | if (!nlist) |
32 | return NULL; | |
33baefe5 | 33 | memset(nlist + oldsize, 0, size - oldsize); |
71fc4c7e TI |
34 | array->list = nlist; |
35 | array->alloced = num; | |
36 | } | |
37 | return snd_array_elem(array, array->used++); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(snd_array_new); | |
40 | ||
41 | /** | |
42 | * snd_array_free - free the given array elements | |
43 | * @array: the array object | |
44 | */ | |
45 | void snd_array_free(struct snd_array *array) | |
46 | { | |
47 | kfree(array->list); | |
48 | array->used = 0; | |
49 | array->alloced = 0; | |
50 | array->list = NULL; | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(snd_array_free); |