1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) IBM Corporation, 2010
5 *
6 * Author: Anton Blanchard <anton@au.ibm.com>
7 */
8#include <linux/export.h>
9#include <linux/compiler.h>
10#include <linux/types.h>
11#include <asm/checksum.h>
12#include <linux/uaccess.h>
13
14__wsum csum_and_copy_from_user(const void __user *src, void *dst,
15			       int len)
16{
17	__wsum csum;
18
19	if (unlikely(!user_read_access_begin(src, len)))
20		return 0;
21
22	csum = csum_partial_copy_generic((void __force *)src, dst, len);
23
24	user_read_access_end();
25	return csum;
26}
27
28__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
29{
30	__wsum csum;
31
32	if (unlikely(!user_write_access_begin(dst, len)))
33		return 0;
34
35	csum = csum_partial_copy_generic(src, (void __force *)dst, len);
36
37	user_write_access_end();
38	return csum;
39}
40