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6bc9a396 CL |
1 | /* |
2 | * arch/score/lib/csum_partial_copy.c | |
3 | * | |
4 | * Score Processor version. | |
5 | * | |
6 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. | |
7 | * Lennox Wu <lennox.wu@sunplusct.com> | |
8 | * Chen Liqin <liqin.chen@sunplusct.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, see the file COPYING, or write | |
22 | * to the Free Software Foundation, Inc., | |
23 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
24 | */ | |
25 | ||
26 | #include <net/checksum.h> | |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | ||
30 | unsigned int csum_partial_copy(const char *src, char *dst, | |
31 | int len, unsigned int sum) | |
32 | { | |
33 | sum = csum_partial(src, len, sum); | |
34 | memcpy(dst, src, len); | |
35 | ||
36 | return sum; | |
37 | } | |
38 | ||
39 | unsigned int csum_partial_copy_from_user(const char *src, char *dst, | |
40 | int len, unsigned int sum, | |
41 | int *err_ptr) | |
42 | { | |
43 | int missing; | |
44 | ||
45 | missing = copy_from_user(dst, src, len); | |
46 | if (missing) { | |
47 | memset(dst + len - missing, 0, missing); | |
48 | *err_ptr = -EFAULT; | |
49 | } | |
50 | ||
51 | return csum_partial(dst, len, sum); | |
52 | } | |
51de2f11 | 53 | EXPORT_SYMBOL(csum_partial_copy_from_user); |