diff options
Diffstat (limited to 'kernel/sound/hda/array.c')
-rw-r--r-- | kernel/sound/hda/array.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/sound/hda/array.c b/kernel/sound/hda/array.c new file mode 100644 index 000000000..516795baa --- /dev/null +++ b/kernel/sound/hda/array.c @@ -0,0 +1,49 @@ +/* + * 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); |