From 71fc4c7ef5ef2d0ddd22f0545ede4c135b554b84 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 3 Mar 2015 17:33:10 +0100 Subject: ALSA: hda - Move generic array helpers to core lib This will be used by the regmap support. Signed-off-by: Takashi Iwai --- sound/hda/array.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 sound/hda/array.c (limited to 'sound/hda/array.c') diff --git a/sound/hda/array.c b/sound/hda/array.c new file mode 100644 index 000000000000..516795baa7db --- /dev/null +++ b/sound/hda/array.c @@ -0,0 +1,49 @@ +/* + * generic arrays + */ + +#include +#include +#include + +/** + * 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); -- cgit v1.2.3