1 /* 2 * generic arrays 3 */ 4 5 #include <linux/slab.h> 6 #include <sound/core.h> 7 #include <sound/hdaudio.h> 8 9 /** 10 * snd_array_new - get a new element from the given array 11 * @array: the array object 12 * 13 * Get a new element from the given array. If it exceeds the 14 * pre-allocated array size, re-allocate the array. 15 * 16 * Returns NULL if allocation failed. 17 */ 18 void *snd_array_new(struct snd_array *array) 19 { 20 if (snd_BUG_ON(!array->elem_size)) 21 return NULL; 22 if (array->used >= array->alloced) { 23 int num = array->alloced + array->alloc_align; 24 int oldsize = array->alloced * array->elem_size; 25 int size = (num + 1) * array->elem_size; 26 void *nlist; 27 if (snd_BUG_ON(num >= 4096)) 28 return NULL; 29 nlist = krealloc(array->list, size, GFP_KERNEL); 30 if (!nlist) 31 return NULL; 32 memset(nlist + oldsize, 0, size - oldsize); 33 array->list = nlist; 34 array->alloced = num; 35 } 36 return snd_array_elem(array, array->used++); 37 } 38 EXPORT_SYMBOL_GPL(snd_array_new); 39 40 /** 41 * snd_array_free - free the given array elements 42 * @array: the array object 43 */ 44 void snd_array_free(struct snd_array *array) 45 { 46 kfree(array->list); 47 array->used = 0; 48 array->alloced = 0; 49 array->list = NULL; 50 } 51 EXPORT_SYMBOL_GPL(snd_array_free); 52