IODeleteDevice and my unload routine?
Posted on 1998-02-20
I am writing my first wdm driver and one thing confuses me. I call IodeleteDevice when I get a critical error from within DriverEntry and somehow this IODeleteDevice makes a call to my unload routine. (I use Softice to debug and set a breakpoint in my unload routine.). And from an example of Art Baker's book , " the Windows NT Device Driver Book",
the IoDeleteDevice gets called from the unload routine, will this create a recursive call between IoDeleteDevice and XXUnload? I guess not. But I don't know the relationship between them. Is the call to the unload routine because there is no more device connecting to the driver? Can
you give me an idea? Or where can I find the answer?
In my driver I need to do some cleaning job in the unload routine and I need reference from deviceExtension, but after Iodeletedevice, everything is gone and I get the blue screen.