[PATCH v1 6/8] powerpc/net: Switch csum_and_copy_{to/from}_user to user_access block

[Christophe Leroy]

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

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/lib/checksum_wrappers.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/lib/checksum_wrappers.c 
b/arch/powerpc/lib/checksum_wrappers.c
index b895166afc82..f3999cbb2fcc 100644
--- a/arch/powerpc/lib/checksum_wrappers.c
+++ b/arch/powerpc/lib/checksum_wrappers.c
@@ -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);
-- 
2.25.0