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parisc: turn csum_partial_copy_from_user() into csum_and_copy_from_user() 

Already has the right semantics.  Incidentally. failing copy_from_user()
zeroes the tail of destination - no need to repeat that manually

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-02-18 13:01:02 -05:00
parent 808b49da54
commit 77a8710ba7
2 changed files with 5 additions and 10 deletions
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3
arch/parisc/include/asm/checksum.h
View File

@ -26,11 +26,12 @@ extern __wsum csum_partial(const void *, int, __wsum);
*/
extern __wsum csum_partial_copy_nocheck(const void *, void *, int, __wsum);
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
/*
* this is a new version of the above that records errors it finds in *errp,
* but continues and zeros the rest of the buffer.
*/
extern __wsum csum_partial_copy_from_user(const void __user *src,
extern __wsum csum_and_copy_from_user(const void __user *src,
void *dst, int len, __wsum sum, int *errp);
/*

12
arch/parisc/lib/checksum.c
View File

@ -128,18 +128,12 @@ EXPORT_SYMBOL(csum_partial_copy_nocheck);
* Copy from userspace and compute checksum. If we catch an exception
* then zero the rest of the buffer.
*/
__wsum csum_partial_copy_from_user(const void __user *src,
__wsum csum_and_copy_from_user(const void __user *src,
void *dst, int len,
__wsum sum, int *err_ptr)
{
int missing;
missing = copy_from_user(dst, src, len);
if (missing) {
memset(dst + len - missing, 0, missing);
if (copy_from_user(dst, src, len))
*err_ptr = -EFAULT;
}
return csum_partial(dst, len, sum);
}
EXPORT_SYMBOL(csum_partial_copy_from_user);
EXPORT_SYMBOL(csum_and_copy_from_user);