diff --git a/reactos/lib/kernel32/file/deviceio.c b/reactos/lib/kernel32/file/deviceio.c
index 8ff7173777b..c6d3c59d84d 100644
--- a/reactos/lib/kernel32/file/deviceio.c
+++ b/reactos/lib/kernel32/file/deviceio.c
@@ -1,4 +1,4 @@
-/* $Id: deviceio.c,v 1.9 2002/09/08 10:22:41 chorns Exp $
+/* $Id: deviceio.c,v 1.10 2002/10/03 19:09:04 robd Exp $
  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS system libraries
@@ -13,6 +13,7 @@
 #include <windows.h>
 
 #define NDEBUG
+//#define DBG
 #include <kernel32/kernel32.h>
 #include <kernel32/error.h>
 
@@ -37,16 +38,34 @@ DeviceIoControl(
 
 	WINBOOL bFsIoControlCode = FALSE;
 
+    DPRINT("DeviceIoControl(hDevice %x dwIoControlCode %d lpInBuffer %x "
+          "nInBufferSize %d lpOutBuffer %x nOutBufferSize %d "
+          "lpBytesReturned %x lpOverlapped %x)\n",
+          hDevice,dwIoControlCode,lpInBuffer,nInBufferSize,lpOutBuffer,
+          nOutBufferSize,lpBytesReturned,lpOverlapped);
+
 	if (lpBytesReturned == NULL)
 	{
+        DPRINT("DeviceIoControl() - returning STATUS_INVALID_PARAMETER\n");
 		SetLastErrorByStatus (STATUS_INVALID_PARAMETER);
 		return FALSE;
 	}
+	//
+	// TODO: Review and approve this change by RobD. IoCtrls for Serial.sys were 
+	//       going to NtFsControlFile instead of NtDeviceIoControlFile.
+	//		 Don't know at this point if anything else is affected by this change.
+	//
+	// if (((dwIoControlCode >> 16) & FILE_DEVICE_FILE_SYSTEM) == FILE_DEVICE_FILE_SYSTEM) {
+	//
+
+	if ((dwIoControlCode >> 16) == FILE_DEVICE_FILE_SYSTEM) {
 
-	if (((dwIoControlCode >> 16) & FILE_DEVICE_FILE_SYSTEM) == FILE_DEVICE_FILE_SYSTEM)
 		bFsIoControlCode = TRUE;
-	else
+        DPRINT("DeviceIoControl() - FILE_DEVICE_FILE_SYSTEM == TRUE %x %x\n", dwIoControlCode, dwIoControlCode >> 16);
+	} else {
 		bFsIoControlCode = FALSE;
+        DPRINT("DeviceIoControl() - FILE_DEVICE_FILE_SYSTEM == FALSE %x %x\n", dwIoControlCode, dwIoControlCode >> 16);
+	}
 
 	if(lpOverlapped  != NULL)
 	{
@@ -88,16 +107,19 @@ DeviceIoControl(
 
 	if (errCode == STATUS_PENDING)
 	{
+        DPRINT("DeviceIoControl() - STATUS_PENDING\n");
 		if (NtWaitForSingleObject(hDevice,FALSE,NULL) < 0)
 		{
 			*lpBytesReturned = IoStatusBlock->Information;
 			SetLastErrorByStatus (errCode);
+            DPRINT("DeviceIoControl() - STATUS_PENDING wait failed.\n");
 			return FALSE;
 		}
 	}
 	else if (!NT_SUCCESS(errCode))
 	{
 		SetLastErrorByStatus (errCode);
+        DPRINT("DeviceIoControl() - ERROR: %x\n", errCode);
 		return FALSE;
 	}