Commit | Line | Data |
---|---|---|
71fc4c7e TI |
1 | /* |
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 | */ | |
18 | void *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; | |
33baefe5 | 24 | int oldsize = array->alloced * array->elem_size; |
71fc4c7e TI |
25 | int size = (num + 1) * array->elem_size; |
26 | void *nlist; | |
27 | if (snd_BUG_ON(num >= 4096)) | |
28 | return NULL; | |
33baefe5 | 29 | nlist = krealloc(array->list, size, GFP_KERNEL); |
71fc4c7e TI |
30 | if (!nlist) |
31 | return NULL; | |
33baefe5 | 32 | memset(nlist + oldsize, 0, size - oldsize); |
71fc4c7e TI |
33 | array->list = nlist; |
34 | array->alloced = num; | |
35 | } | |
36 | return snd_array_elem(array, array->used++); | |
37 | } | |
38 | EXPORT_SYMBOL_GPL(snd_array_new); | |
39 | ||
40 | /** | |
41 | * snd_array_free - free the given array elements | |
42 | * @array: the array object | |
43 | */ | |
44 | void 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 | } | |
51 | EXPORT_SYMBOL_GPL(snd_array_free); |