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Linux/sound/hda/array.c

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  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 size = (num + 1) * array->elem_size;
 25                 void *nlist;
 26                 if (snd_BUG_ON(num >= 4096))
 27                         return NULL;
 28                 nlist = krealloc(array->list, size, GFP_KERNEL | __GFP_ZERO);
 29                 if (!nlist)
 30                         return NULL;
 31                 array->list = nlist;
 32                 array->alloced = num;
 33         }
 34         return snd_array_elem(array, array->used++);
 35 }
 36 EXPORT_SYMBOL_GPL(snd_array_new);
 37 
 38 /**
 39  * snd_array_free - free the given array elements
 40  * @array: the array object
 41  */
 42 void snd_array_free(struct snd_array *array)
 43 {
 44         kfree(array->list);
 45         array->used = 0;
 46         array->alloced = 0;
 47         array->list = NULL;
 48 }
 49 EXPORT_SYMBOL_GPL(snd_array_free);
 50 

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