| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 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; |
| 25 | int oldsize = array->alloced * array->elem_size; |
| 26 | int size = (num + 1) * array->elem_size; |
| 27 | void *nlist; |
| 28 | if (snd_BUG_ON(num >= 4096)) |
| 29 | return NULL; |
| 30 | nlist = krealloc(objp: array->list, new_size: size, GFP_KERNEL); |
| 31 | if (!nlist) |
| 32 | return NULL; |
| 33 | memset(nlist + oldsize, 0, size - oldsize); |
| 34 | array->list = nlist; |
| 35 | array->alloced = num; |
| 36 | } |
| 37 | return snd_array_elem(array, idx: 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(objp: array->list); |
| 48 | array->used = 0; |
| 49 | array->alloced = 0; |
| 50 | array->list = NULL; |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(snd_array_free); |
| 53 |