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ALSA: hda - Move generic array helpers to core lib

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This will be used by the regmap support.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-03-03 17:33:10 +01:00
parent e311782acd
commit 71fc4c7ef5
5 changed files with 84 additions and 77 deletions
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49
sound/hda/array.c Normal file
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/*
* generic arrays
*/
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/hdaudio.h>
/**
* snd_array_new - get a new element from the given array
* @array: the array object
*
* Get a new element from the given array. If it exceeds the
* pre-allocated array size, re-allocate the array.
*
* Returns NULL if allocation failed.
*/
void *snd_array_new(struct snd_array *array)
{
if (snd_BUG_ON(!array->elem_size))
return NULL;
if (array->used >= array->alloced) {
int num = array->alloced + array->alloc_align;
int size = (num + 1) * array->elem_size;
void *nlist;
if (snd_BUG_ON(num >= 4096))
return NULL;
nlist = krealloc(array->list, size, GFP_KERNEL | __GFP_ZERO);
if (!nlist)
return NULL;
array->list = nlist;
array->alloced = num;
}
return snd_array_elem(array, array->used++);
}
EXPORT_SYMBOL_GPL(snd_array_new);
/**
* snd_array_free - free the given array elements
* @array: the array object
*/
void snd_array_free(struct snd_array *array)
{
kfree(array->list);
array->used = 0;
array->alloced = 0;
array->list = NULL;
}
EXPORT_SYMBOL_GPL(snd_array_free);