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ALSA: hda - Add generic arrays

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Added helper functions to handle generic arrays.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-07-30 15:01:44 +02:00
parent 176d5335fe
commit b2e1859745
2 changed files with 54 additions and 0 deletions
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34
sound/pci/hda/hda_codec.c
View File

@ -3196,3 +3196,37 @@ int snd_hda_codecs_inuse(struct hda_bus *bus)
}
#endif
#endif
/*
* generic arrays
*/
/* get a new element from the given array
* if it exceeds the pre-allocated array size, re-allocate the array
*/
void *snd_array_new(struct snd_array *array)
{
if (array->used >= array->alloced) {
int num = array->alloced + array->alloc_align;
void *nlist = kcalloc(num + 1, array->elem_size, GFP_KERNEL);
if (!nlist)
return NULL;
if (array->list) {
memcpy(nlist, array->list,
array->elem_size * array->alloced);
kfree(array->list);
}
array->list = nlist;
array->alloced = num;
}
return array->list + (array->used++ * array->elem_size);
}
/* free the given array elements */
void snd_array_free(struct snd_array *array)
{
kfree(array->list);
array->used = 0;
array->alloced = 0;
array->list = NULL;
}

20
sound/pci/hda/hda_codec.h
View File

@ -519,6 +519,26 @@ enum {
/* max. codec address */
#define HDA_MAX_CODEC_ADDRESS 0x0f
/*
* generic arrays
*/
struct snd_array {
unsigned int used;
unsigned int alloced;
unsigned int elem_size;
unsigned int alloc_align;
void *list;
};
void *snd_array_new(struct snd_array *array);
void snd_array_free(struct snd_array *array);
static inline void snd_array_init(struct snd_array *array, unsigned int size,
unsigned int align)
{
array->elem_size = size;
array->alloc_align = align;
}
/*
* Structures
*/