Hello all. I was wondering if anyone is familiar with WDM driver
cancellation routines.
Any help would be greatly appreciated. Thanks.
The following WDM PCI driver cancellation routine causes a system reset on
Windows 2000/XP.
Debugging it with NuMega SoftICE results in “Break due to Page Fault
(0Eh). Fault=0002” at the
KeRemoveEntryDeviceQueue() method call in the OnCancelReadWrite() routine
below.
I copied this code out the “Windows NT device driver development” book by
P. Viscarola & W. Mason - OSR
Ch 14 page 355 example 14.7
Here are the calling methods:
.
.
case BL_SEND:
IoMarkIrpPending(Irp );
IoStartPacket( DeviceObject, Irp, 0, OnCancelReadWrite );
status = STATUS_PENDING;
break;
case BL_RECEIVE:
IoMarkIrpPending(Irp );
IoStartPacket( DeviceObject, Irp, 0, OnCancelReadWrite );
status = STATUS_PENDING;
break;
.
.
VOID OnCancelReadWrite(IN PDEVICE_OBJECT fdo, IN PIRP Irp)
{
if (fdo->CurrentIrp == Irp)
{
IoReleaseCancelSpinLock(Irp->CancelIrql);
IoStartNextPacket(fdo, TRUE);
}
else
{
KeRemoveEntryDeviceQueue(&fdo->DeviceQueue,
&Irp->Tail.Overlay.DeviceQueueEntry);
IoReleaseCancelSpinLock(Irp->CancelIrql);
}
Irp->IoStatus.Status = STATUS_CANCELLED;
Irp->IoStatus.Information = 0;
IoSetCancelRoutine( Irp, NULL);
IoCompleteRequest(Irp,IO_NO_INCREMENT);
}
I have also experimented with using the following verses using
KeRemoveEntryDeviceQueue(), but
Also have the same page fault error.
RemoveEntryList(&Irp->Tail.Overlay.ListEntry);
or
PBLACE_DEVICE_EXTENSION pDeviceExtension =
fdo->DeviceExtension;
KeRemoveQueueDpc(&pDeviceExtension->BuslaceDpcObject);
If you are interested in the details of the driver code,
Click here:
http://oxygenaddicts.com/code/pci_wdm.c
John Carneiro
Email and Microsoft Messenger ID
mailto:xxxxx xxxxx@waters.com
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