The following is the part of the code in PNP.
NTSTATUS
BulkUsb_DispatchPnP(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
The plug and play dispatch routines.
Most of these requests the driver will completely ignore.
In all cases it must pass on the IRP to the lower driver.
Arguments:
DeviceObject - pointer to a device object.
Irp - pointer to an I/O Request Packet.
Return Value:
NT status value
–*/
{
PIO_STACK_LOCATION irpStack;
PDEVICE_EXTENSION deviceExtension;
KEVENT startDeviceEvent;
NTSTATUS ntStatus;
//
// initialize variables
//
irpStack = IoGetCurrentIrpStackLocation(Irp);
deviceExtension = DeviceObject->DeviceExtension;
//
// since the device is removed, fail the Irp.
//
if(Removed == deviceExtension->DeviceState) {
ntStatus = STATUS_DELETE_PENDING;
Irp->IoStatus.Status = ntStatus;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return ntStatus;
}
BulkUsb_DbgPrint(3, (“///////////////////////////////////////////\n”));
BulkUsb_DbgPrint(3, (“BulkUsb_DispatchPnP::”));
BulkUsb_IoIncrement(deviceExtension);
if(irpStack->MinorFunction == IRP_MN_START_DEVICE) {
ASSERT(deviceExtension->IdleReqPend == 0);
}
else {
if(deviceExtension->SSEnable) {
CancelSelectSuspend(deviceExtension);
}
}
BulkUsb_DbgPrint(2, (PnPMinorFunctionString(irpStack->MinorFunction)));
switch(irpStack->MinorFunction) {
case IRP_MN_START_DEVICE:
ntStatus = HandleStartDevice(DeviceObject, Irp);
break;
case IRP_MN_QUERY_STOP_DEVICE:
//
// if we cannot stop the device, we fail the query stop irp
//
ntStatus = CanStopDevice(DeviceObject, Irp);
if(NT_SUCCESS(ntStatus)) {
ntStatus = HandleQueryStopDevice(DeviceObject, Irp);
return ntStatus;
}
break;
case IRP_MN_CANCEL_STOP_DEVICE:
ntStatus = HandleCancelStopDevice(DeviceObject, Irp);
break;
case IRP_MN_STOP_DEVICE:
ntStatus = HandleStopDevice(DeviceObject, Irp);
BulkUsb_DbgPrint(3, (“BulkUsb_DispatchPnP::IRP_MN_STOP_DEVICE::”));
BulkUsb_IoDecrement(deviceExtension);
return ntStatus;
case IRP_MN_QUERY_REMOVE_DEVICE:
//
// if we cannot remove the device, we fail the query remove irp
//
ntStatus = HandleQueryRemoveDevice(DeviceObject, Irp);
return ntStatus;
case IRP_MN_CANCEL_REMOVE_DEVICE:
ntStatus = HandleCancelRemoveDevice(DeviceObject, Irp);
break;
case IRP_MN_SURPRISE_REMOVAL:
ntStatus = HandleSurpriseRemoval(DeviceObject, Irp);
BulkUsb_DbgPrint(3, (“BulkUsb_DispatchPnP::IRP_MN_SURPRISE_REMOVAL::”));
BulkUsb_IoDecrement(deviceExtension);
return ntStatus;
case IRP_MN_REMOVE_DEVICE:
ntStatus = HandleRemoveDevice(DeviceObject, Irp);
return ntStatus;
case IRP_MN_QUERY_CAPABILITIES:
ntStatus = HandleQueryCapabilities(DeviceObject, Irp);
break;
default:
IoSkipCurrentIrpStackLocation(Irp);
ntStatus = IoCallDriver(deviceExtension->TopOfStackDeviceObject, Irp);
BulkUsb_DbgPrint(3, (“BulkUsb_DispatchPnP::default::”));
BulkUsb_IoDecrement(deviceExtension);
return ntStatus;
} // switch
//
// complete request
//
Irp->IoStatus.Status = ntStatus;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
//
// decrement count
//
BulkUsb_DbgPrint(3, (“BulkUsb_DispatchPnP::”));
BulkUsb_IoDecrement(deviceExtension);
return ntStatus;
}
Hey, I have to do some work, too. Lamenting has a bit lower priority
