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Linux/sound/hda/array.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * generic arrays
  4  */
  5 
  6 #include <linux/slab.h>
  7 #include <sound/core.h>
  8 #include <sound/hdaudio.h>
  9 
 10 /**
 11  * snd_array_new - get a new element from the given array
 12  * @array: the array object
 13  *
 14  * Get a new element from the given array.  If it exceeds the
 15  * pre-allocated array size, re-allocate the array.
 16  *
 17  * Returns NULL if allocation failed.
 18  */
 19 void *snd_array_new(struct snd_array *array)
 20 {
 21         if (snd_BUG_ON(!array->elem_size))
 22                 return NULL;
 23         if (array->used >= array->alloced) {
 24                 int num = array->alloced + array->alloc_align;
 25                 int oldsize = array->alloced * array->elem_size;
 26                 int size = (num + 1) * array->elem_size;
 27                 void *nlist;
 28                 if (snd_BUG_ON(num >= 4096))
 29                         return NULL;
 30                 nlist = krealloc(array->list, size, GFP_KERNEL);
 31                 if (!nlist)
 32                         return NULL;
 33                 memset(nlist + oldsize, 0, size - oldsize);
 34                 array->list = nlist;
 35                 array->alloced = num;
 36         }
 37         return snd_array_elem(array, array->used++);
 38 }
 39 EXPORT_SYMBOL_GPL(snd_array_new);
 40 
 41 /**
 42  * snd_array_free - free the given array elements
 43  * @array: the array object
 44  */
 45 void snd_array_free(struct snd_array *array)
 46 {
 47         kfree(array->list);
 48         array->used = 0;
 49         array->alloced = 0;
 50         array->list = NULL;
 51 }
 52 EXPORT_SYMBOL_GPL(snd_array_free);
 53 

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