From d3753b2d2f194144f40e0d49e959301fe4ea22f8 Mon Sep 17 00:00:00 2001
From: Filip Navara <filip.navara@gmail.com>
Date: Wed, 18 Feb 2004 16:00:56 +0000
Subject: [PATCH] - Attempt to avoid interaction with kernel debugging over
 serial port.

svn path=/trunk/; revision=8246
---
 reactos/drivers/input/sermouse/sermouse.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/reactos/drivers/input/sermouse/sermouse.c b/reactos/drivers/input/sermouse/sermouse.c
index 9f73ee80630..f1b64e189d5 100644
--- a/reactos/drivers/input/sermouse/sermouse.c
+++ b/reactos/drivers/input/sermouse/sermouse.c
@@ -11,6 +11,12 @@
 #include <ddk/ntddk.h>
 #include <ddk/ntddmou.h>
 
+/*
+ * HAL:KdComPortInUse used to prevent detecting mouse on port
+ * that is occupied by kernel debugger.
+ */
+ULONG DECLSPEC_IMPORT KdComPortInUse;
+
 /*
  * Compile time options
  */
@@ -568,6 +574,10 @@ InitializeMouse(ULONG Port, ULONG Irq, PDRIVER_OBJECT DriverObject)
 	KAFFINITY Affinity;
 	ULONG MouseType;
 
+	/* Don't detect mouse on port that is occupied by kernel debugger */
+	if (KdComPortInUse == Port)
+		return FALSE;
+
 	/* Try to detect mouse on specified port */
 	MouseType = DetectMicrosoftMouse(Port);