[navaraf] 33717: Fix incorrect logic in IntVideoPortSetupInterrupt and add comment.

Author: navaraf
Date: Mon May 26 13:32:40 2008
New Revision: 33717

URL: http://svn.reactos.org/svn/reactos?rev=33717&view=rev
Log:
Fix incorrect logic in IntVideoPortSetupInterrupt and add comment.

Modified:
    trunk/reactos/drivers/video/videoprt/interrupt.c

Modified: trunk/reactos/drivers/video/videoprt/interrupt.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/video/videoprt/inte...
==============================================================================
--- trunk/reactos/drivers/video/videoprt/interrupt.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/video/videoprt/interrupt.c [iso-8859-1] Mon May 26 13:32:40 2008
@@ -48,13 +48,17 @@

DeviceExtension = (PVIDEO_PORT_DEVICE_EXTENSION)DeviceObject->DeviceExtension;

-   if (ConfigInfo->BusInterruptVector == 0)
-      ConfigInfo->BusInterruptVector = DeviceExtension->InterruptVector;
+   /*
+    * MSDN documentation for VIDEO_PORT_CONFIG_INFO states: "If a miniport driver's
+    * HwVidFindAdapter function finds that the video adapter does not generate
+    * interrupts or that it cannot determine a valid interrupt vector/level for
+    * the adapter, HwVidFindAdapter should set both BusInterruptVector and
+    * BusInterruptLevel to zero.
+    */

-   if (ConfigInfo->BusInterruptLevel == 0)
-      ConfigInfo->BusInterruptLevel = DeviceExtension->InterruptLevel;
-
-   if (DriverExtension->InitializationData.HwInterrupt != NULL)
+   if (DriverExtension->InitializationData.HwInterrupt != NULL &&
+       ConfigInfo->BusInterruptLevel != 0 &&
+       ConfigInfo->BusInterruptVector != 0)
    {
       ULONG InterruptVector;
       KIRQL Irql;