sound/hda/array.c

   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);