diff options
Diffstat (limited to 'arch/mips/lib/csum_partial_copy.c')
| -rw-r--r-- | arch/mips/lib/csum_partial_copy.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/mips/lib/csum_partial_copy.c b/arch/mips/lib/csum_partial_copy.c new file mode 100644 index 00000000000..ffed0a6a1c1 --- /dev/null +++ b/arch/mips/lib/csum_partial_copy.c @@ -0,0 +1,49 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1994, 1995 Waldorf Electronics GmbH + * Copyright (C) 1998, 1999 Ralf Baechle + */ +#include <linux/kernel.h> +#include <linux/types.h> +#include <asm/byteorder.h> +#include <asm/string.h> +#include <asm/uaccess.h> +#include <net/checksum.h> + +/* + * copy while checksumming, otherwise like csum_partial + */ +unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned char *dst, + int len, unsigned int sum) +{ + /* + * It's 2:30 am and I don't feel like doing it real ... + * This is lots slower than the real thing (tm) + */ + sum = csum_partial(src, len, sum); + memcpy(dst, src, len); + + return sum; +} + +/* + * Copy from userspace and compute checksum. If we catch an exception + * then zero the rest of the buffer. + */ +unsigned int csum_partial_copy_from_user (const unsigned char *src, unsigned char *dst, + int len, unsigned int sum, int *err_ptr) +{ + int missing; + + might_sleep(); + missing = copy_from_user(dst, src, len); + if (missing) { + memset(dst + len - missing, 0, missing); + *err_ptr = -EFAULT; + } + + return csum_partial(dst, len, sum); +} |