Driverstudio中如何使用DPC――不是给中断用的

在SerialRead里看到：
// TODO: If the data is not yet available, initiate a request to the
// physical device here, and defer the Information, Status,
// and NextIrp handling until the hardware indicates that the
// read is complete.  Typically, this might be handled in a
// DPC that is called after the hardware finishes transferring
// the data.
尝试了使用KDeferredCall,但是发现IRP无法传给DPC，谁能给出几行简单的代码？我要做的就是用ind从PCI卡上读些数据，我的是直接IO方式

[编辑 -  12/15/03 by  dswei]