4b16f8e2d6
All these files were including module.h just for the basic EXPORT_SYMBOL infrastructure. We can shift them off to the export.h header which is a way smaller footprint and thus realize some compile time gains. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* 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 <asm/uaccess.h>
|
|
|
|
__wsum csum_and_copy_from_user(const void __user *src, void *dst,
|
|
int len, __wsum sum, int *err_ptr)
|
|
{
|
|
unsigned int csum;
|
|
|
|
might_sleep();
|
|
|
|
*err_ptr = 0;
|
|
|
|
if (!len) {
|
|
csum = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely((len < 0) || !access_ok(VERIFY_READ, src, len))) {
|
|
*err_ptr = -EFAULT;
|
|
csum = (__force unsigned int)sum;
|
|
goto out;
|
|
}
|
|
|
|
csum = csum_partial_copy_generic((void __force *)src, dst,
|
|
len, sum, err_ptr, NULL);
|
|
|
|
if (unlikely(*err_ptr)) {
|
|
int missing = __copy_from_user(dst, src, len);
|
|
|
|
if (missing) {
|
|
memset(dst + len - missing, 0, missing);
|
|
*err_ptr = -EFAULT;
|
|
} else {
|
|
*err_ptr = 0;
|
|
}
|
|
|
|
csum = csum_partial(dst, len, sum);
|
|
}
|
|
|
|
out:
|
|
return (__force __wsum)csum;
|
|
}
|
|
EXPORT_SYMBOL(csum_and_copy_from_user);
|
|
|
|
__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
|
|
__wsum sum, int *err_ptr)
|
|
{
|
|
unsigned int csum;
|
|
|
|
might_sleep();
|
|
|
|
*err_ptr = 0;
|
|
|
|
if (!len) {
|
|
csum = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (unlikely((len < 0) || !access_ok(VERIFY_WRITE, dst, len))) {
|
|
*err_ptr = -EFAULT;
|
|
csum = -1; /* invalid checksum */
|
|
goto out;
|
|
}
|
|
|
|
csum = csum_partial_copy_generic(src, (void __force *)dst,
|
|
len, sum, NULL, err_ptr);
|
|
|
|
if (unlikely(*err_ptr)) {
|
|
csum = csum_partial(src, len, sum);
|
|
|
|
if (copy_to_user(dst, src, len)) {
|
|
*err_ptr = -EFAULT;
|
|
csum = -1; /* invalid checksum */
|
|
}
|
|
}
|
|
|
|
out:
|
|
return (__force __wsum)csum;
|
|
}
|
|
EXPORT_SYMBOL(csum_and_copy_to_user);
|