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powerpc/net: Switch csum_and_copy_{to/from}_user to user_access block 

Use user_access_begin() instead of the
might_sleep/access_ok/allow_access sequence.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2dee286d2d6dc9a27d99e31ac564bad4fae2cb49.1615398498.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-03-10 17:57:05 +00:00 committed by Michael Ellerman
parent e63ceebdad
commit 164dc6ce36
1 changed files with 4 additions and 11 deletions
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15
arch/powerpc/lib/checksum_wrappers.c
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@ -16,16 +16,12 @@ __wsum csum_and_copy_from_user(const void __user *src, void *dst,
{
__wsum csum;
might_sleep();
if (unlikely(!access_ok(src, len)))
if (unlikely(!user_read_access_begin(src, len)))
return 0;
allow_read_from_user(src, len);
csum = csum_partial_copy_generic((void __force *)src, dst, len);
prevent_read_from_user(src, len);
user_read_access_end();
return csum;
}
EXPORT_SYMBOL(csum_and_copy_from_user);
@ -34,15 +30,12 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
{
__wsum csum;
might_sleep();
if (unlikely(!access_ok(dst, len)))
if (unlikely(!user_write_access_begin(dst, len)))
return 0;
allow_write_to_user(dst, len);
csum = csum_partial_copy_generic(src, (void __force *)dst, len);
prevent_write_to_user(dst, len);
user_write_access_end();
return csum;
}
EXPORT_SYMBOL(csum_and_copy_to_user);