cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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array.c (1247B)

      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 */
     19void *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}
     39EXPORT_SYMBOL_GPL(snd_array_new);
     40
     41/**
     42 * snd_array_free - free the given array elements
     43 * @array: the array object
     44 */
     45void 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}
     52EXPORT_SYMBOL_GPL(snd_array_free);