[NET]: IA64 checksum annotations and cleanups.

* sanitize prototypes, annotate
* ntohs -> shift in checksum calculations
* kill access_ok() in csum_partial_copy_from_user
* collapse do_csum_partial_copy_from_user

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/ia64/lib/csum_partial_copy.c b/arch/ia64/lib/csum_partial_copy.c
index 36866e8a5d2b..503dfe6d1450 100644
--- a/arch/ia64/lib/csum_partial_copy.c
+++ b/arch/ia64/lib/csum_partial_copy.c
@@ -104,9 +104,9 @@ out:
  */
 extern unsigned long do_csum(const unsigned char *, long);
 
-static unsigned int
-do_csum_partial_copy_from_user (const unsigned char __user *src, unsigned char *dst,
-                                int len, unsigned int psum, int *errp)
+__wsum
+csum_partial_copy_from_user(const void __user *src, void *dst,
+                                int len, __wsum psum, int *errp)
 {
         unsigned long result;
 
@@ -122,30 +122,17 @@ do_csum_partial_copy_from_user (const unsigned char __user *src, unsigned char *
         result = do_csum(dst, len);
 
         /* add in old sum, and carry.. */
-        result += psum;
+        result += (__force u32)psum;
         /* 32+c bits -> 32 bits */
         result = (result & 0xffffffff) + (result >> 32);
-        return result;
-}
-
-unsigned int
-csum_partial_copy_from_user (const unsigned char __user *src, unsigned 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)result;
 }
 
-unsigned int
-csum_partial_copy_nocheck(const unsigned char __user *src, unsigned 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);
 }
 
 EXPORT_SYMBOL(csum_partial_copy_nocheck);