diff --git a/drivers/char/rio/rio_linux.c b/drivers/char/rio/rio_linux.c
index 8f96b20090e8..aa43436d5d1b 100644
--- a/drivers/char/rio/rio_linux.c
+++ b/drivers/char/rio/rio_linux.c
@@ -335,7 +335,7 @@ int RIODelay_ni(struct Port *PortP, int njiffies)
 
 void rio_copy_to_card(void *from, void __iomem *to, int len)
 {
-	rio_memcpy_toio(NULL, to, from, len);
+	rio_copy_toio(to, from, len);
 }
 
 int rio_minor(struct tty_struct *tty)
diff --git a/drivers/char/rio/rio_linux.h b/drivers/char/rio/rio_linux.h
index 99c7447b6113..55b9c97e8477 100644
--- a/drivers/char/rio/rio_linux.h
+++ b/drivers/char/rio/rio_linux.h
@@ -138,12 +138,23 @@ static inline void __iomem *rio_memcpy_toio(void __iomem *dummy, void __iomem *d
 
 	while (n--) {
 		writeb(*src++, dst++);
-		(void) readb(dummy);	/* WTF? */
+		(void) readb(dummy);
 	}
 
 	return dest;
 }
 
+static inline void __iomem *rio_copy_toio(void __iomem *dest, void *source, int n)
+{
+	char __iomem *dst = dest;
+	char *src = source;
+
+	while (n--)
+		writeb(*src++, dst++);
+
+	return dest;
+}
+
 
 static inline void *rio_memcpy_fromio(void *dest, void __iomem *source, int n)
 {
@@ -158,6 +169,7 @@ static inline void *rio_memcpy_fromio(void *dest, void __iomem *source, int n)
 
 #else
 #define rio_memcpy_toio(dummy,dest,source,n)   memcpy_toio(dest, source, n)
+#define rio_copy_toio   		       memcpy_toio
 #define rio_memcpy_fromio                      memcpy_fromio
 #endif