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MIPS: asm: checksum: Split kernel and user copy operations

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In EVA mode, different instructions need to be used to read/write
from kernel and userland. In non-EVA mode, there is no functional
difference. The current address limit is checked to decide the
type of operation that will be performed.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Leonid Yegoshin 2013-12-19 17:09:17 +00:00 committed by Ralf Baechle
parent 6f85cebe49
commit fb316913f8
1 changed files with 16 additions and 6 deletions
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22
arch/mips/include/asm/checksum.h
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@ -37,7 +37,6 @@ __wsum __csum_partial_copy_from_user(const void *src, void *dst,
int len, __wsum sum, int *err_ptr);
__wsum __csum_partial_copy_to_user(const void *src, void *dst,
int len, __wsum sum, int *err_ptr);
/*
* this is a new version of the above that records errors it finds in *errp,
* but continues and zeros the rest of the buffer.
@ -47,8 +46,12 @@ __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
__wsum sum, int *err_ptr)
{
might_fault();
return __csum_partial_copy_from_user((__force void *)src, dst,
len, sum, err_ptr);
if (segment_eq(get_fs(), get_ds()))
return __csum_partial_copy_kernel((__force void *)src, dst,
len, sum, err_ptr);
else
return __csum_partial_copy_from_user((__force void *)src, dst,
len, sum, err_ptr);
}
/*
@ -60,9 +63,16 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
__wsum sum, int *err_ptr)
{
might_fault();
if (access_ok(VERIFY_WRITE, dst, len))
return __csum_partial_copy_to_user(src, (__force void *)dst,
len, sum, err_ptr);
if (access_ok(VERIFY_WRITE, dst, len)) {
if (segment_eq(get_fs(), get_ds()))
return __csum_partial_copy_kernel(src,
(__force void *)dst,
len, sum, err_ptr);
else
return __csum_partial_copy_to_user(src,
(__force void *)dst,
len, sum, err_ptr);
}
if (len)
*err_ptr = -EFAULT;