usb2com.close.cpp

这是一个关于USB转接串口的驱动程序开发

//********************************************************************
//	created:	11:7:2008   21:29
//	file:		usb2com.close.cpp
//	author:		tiamo
//	purpose:	close
//********************************************************************

#include "stdafx.h"

//
// close dispatch routine
//
NTSTATUS Usb2ComClose(__in PDEVICE_OBJECT DeviceObject,__in PIRP Irp)
{
	PUSB2COM_DEVICE_EXTENSION DevExt					= static_cast<PUSB2COM_DEVICE_EXTENSION>(DeviceObject->DeviceExtension);

	Usb2ComCancelAllIrps(DevExt);

	DevExt->TxHoldReason								= 0;
	DevExt->RxHoldReason								= 0;

	InterlockedExchange(&DevExt->DeviceIsOpened,FALSE);

	Irp->IoStatus.Status								= STATUS_SUCCESS;
	Irp->IoStatus.Information							= 0;
	IoCompleteRequest(Irp,IO_NO_INCREMENT);

	return STATUS_SUCCESS;
}