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Commit b2e18597 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: hda - Add generic arrays 



Added helper functions to handle generic arrays.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 176d5335

sound/pci/hda/hda_codec.c

+34 −0
Original line number Diff line number Diff line
@@ -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;

}

sound/pci/hda/hda_codec.h

+20 −0
Original line number Diff line number Diff line
@@ -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

 */