[NET]: Alpha checksum annotations and cleanups.

* sanitize prototypes and annotate
* kill useless access_ok() in csum_partial_copy_from_user() (the only
caller checks it already).
* do_csum_partial_copy_from_user() is not needed now
* replace htons(len) with len << 8 - they are the same wrt checksums
on little-endian.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 22 deletions

diff --git a/arch/alpha/lib/csum_partial_copy.c b/arch/alpha/lib/csum_partial_copy.c
index a37948f3037a..4ca75c74ce90 100644
--- a/arch/alpha/lib/csum_partial_copy.c
+++ b/arch/alpha/lib/csum_partial_copy.c
@@ -329,11 +329,11 @@ csum_partial_cfu_unaligned(const unsigned long __user * src,
         return checksum;
 }
 
-static unsigned int
-do_csum_partial_copy_from_user(const char __user *src, char *dst, int len,
-                               unsigned int sum, int *errp)
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst, int len,
+                               __wsum sum, int *errp)
 {
-        unsigned long checksum = (unsigned) sum;
+        unsigned long checksum = (__force u32) sum;
         unsigned long soff = 7 & (unsigned long) src;
         unsigned long doff = 7 & (unsigned long) dst;
 
@@ -367,25 +367,12 @@ do_csum_partial_copy_from_user(const char __user *src, char *dst, int len,
                 }
                 checksum = from64to16 (checksum);
         }
-        return checksum;
-}
-
-unsigned int
-csum_partial_copy_from_user(const char __user *src, char *dst, int len,
-                            unsigned int sum, int *errp)
-{
-        if (!access_ok(VERIFY_READ, src, len)) {
-                *errp = -EFAULT;
-                memset(dst, 0, len);
-                return sum;
-        }
-
-        return do_csum_partial_copy_from_user(src, dst, len, sum, errp);
+        return (__force __wsum)checksum;
 }
 
-unsigned int
-csum_partial_copy_nocheck(const char __user *src, char *dst, int len,
-                          unsigned int sum)
+__wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
 {
-        return do_csum_partial_copy_from_user(src, dst, len, sum, NULL);
+        return csum_partial_copy_from_user((__force const void __user *)src,
+                        dst, len, sum, NULL);
 }