diff --git a/arch/um/include/sysdep-i386/checksum.h b/arch/um/include/sysdep-i386/checksum.h
index 3a2a458..764ba4d 100644
--- a/arch/um/include/sysdep-i386/checksum.h
+++ b/arch/um/include/sysdep-i386/checksum.h
@@ -24,19 +24,6 @@
 			  unsigned int sum);
 
 /*
- * the same as csum_partial, but copies from src while it
- * checksums, and handles user-space pointer exceptions correctly, when needed.
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
-
-unsigned int csum_partial_copy_to(const unsigned char *src, unsigned char *dst,
-				  int len, int sum, int *err_ptr);
-unsigned int csum_partial_copy_from(const unsigned char *src, unsigned char *dst,
-				    int len, int sum, int *err_ptr);
-
-/*
  *	Note: when you get a NULL pointer exception here this means someone
  *	passed in an incorrect kernel address to one of these functions.
  *
@@ -52,11 +39,24 @@
 	return(csum_partial(dst, len, sum));
 }
 
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums, and handles user-space pointer exceptions correctly, when needed.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
 static __inline__
 unsigned int csum_partial_copy_from_user(const unsigned char *src, unsigned char *dst,
 					 int len, int sum, int *err_ptr)
 {
-	return csum_partial_copy_from(src, dst, len, sum, err_ptr);
+	if(copy_from_user(dst, src, len)){
+		*err_ptr = -EFAULT;
+		return(-1);
+	}
+
+	return csum_partial(dst, len, sum);
 }
 
 /*
@@ -67,7 +67,6 @@
  */
 
 #define csum_partial_copy_fromuser csum_partial_copy_from_user
-unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst, int len, int sum);
 
 /*
  *	This is a version of ip_compute_csum() optimized for IP headers,
@@ -196,8 +195,14 @@
 						     unsigned char *dst,
 						     int len, int sum, int *err_ptr)
 {
-	if (access_ok(VERIFY_WRITE, dst, len))
-		return(csum_partial_copy_to(src, dst, len, sum, err_ptr));
+	if (access_ok(VERIFY_WRITE, dst, len)){
+		if(copy_to_user(dst, src, len)){
+			*err_ptr = -EFAULT;
+			return(-1);
+		}
+
+		return csum_partial(src, len, sum);
+	}
 
 	if (len)
 		*err_ptr = -EFAULT;