--- a/drivers/net/wireless/rt2x00/rt2x00pci.h	2011-04-25 13:14:25.000000000 -0400
+++ a/drivers/net/wireless/rt2x00/rt2x00pci.h	2011-04-25 13:14:56.000000000 -0400
@@ -64,7 +64,7 @@ static inline void rt2x00pci_register_mu
 						 const void *value,
 						 const u32 length)
 {
-	memcpy_toio(rt2x00dev->csr.base + offset, value, length);
+	__iowrite32_copy(rt2x00dev->csr.base + offset, value, length >> 2);
 }
 
 /**