mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
164dc6ce36
Use user_access_begin() instead of the might_sleep/access_ok/allow_access sequence. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/2dee286d2d6dc9a27d99e31ac564bad4fae2cb49.1615398498.git.christophe.leroy@csgroup.eu
41 lines
891 B
C
41 lines
891 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
*
|
|
* Copyright (C) IBM Corporation, 2010
|
|
*
|
|
* Author: Anton Blanchard <anton@au.ibm.com>
|
|
*/
|
|
#include <linux/export.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/types.h>
|
|
#include <asm/checksum.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
__wsum csum_and_copy_from_user(const void __user *src, void *dst,
|
|
int len)
|
|
{
|
|
__wsum csum;
|
|
|
|
if (unlikely(!user_read_access_begin(src, len)))
|
|
return 0;
|
|
|
|
csum = csum_partial_copy_generic((void __force *)src, dst, len);
|
|
|
|
user_read_access_end();
|
|
return csum;
|
|
}
|
|
EXPORT_SYMBOL(csum_and_copy_from_user);
|
|
|
|
__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
|
|
{
|
|
__wsum csum;
|
|
|
|
if (unlikely(!user_write_access_begin(dst, len)))
|
|
return 0;
|
|
|
|
csum = csum_partial_copy_generic(src, (void __force *)dst, len);
|
|
|
|
user_write_access_end();
|
|
return csum;
|
|
}
|
|
EXPORT_SYMBOL(csum_and_copy_to_user);
|