surpriseremove test error

My driver is for usb device. I try to test
surpriseremove. HCT simulates unpluging device. My driver
steps into PnpSurpriseRemove, PnpRemove and Unload
routine. Whwn HCT try to "insert" device, the device
manager shows :"Windows cannot load the device driver for
this hardware because a previous instance of the device
driver is still in memory. (Code 38)". Why?

>-----Original Message-----
>My driver is for usb device. I try to test
>surpriseremove. HCT simulates unpluging device. My
driver
>steps into PnpSurpriseRemove, PnpRemove and Unload
>routine. Whwn HCT try to "insert" device, the device
>manager shows :"Windows cannot load the device driver
for
>this hardware because a previous instance of the device
>driver is still in memory. (Code 38)". Why?
>
>.
>

After I restart computer and restart HCT, every thing is
OK! But it's not acceptable. It must work normally on the
first run of HCT. Help me!

This could due to improper reference count or an race between load and
unload operations. Or the driver was referenced multiple time by the device.


"steven" <stevenl2003@hotmail.com> wrote in message
news:071b01c358ca$ad6c9b80$a301280a@phx.gbl...
>
> >-----Original Message-----
> >My driver is for usb device. I try to test
> >surpriseremove. HCT simulates unpluging device. My
> driver
> >steps into PnpSurpriseRemove, PnpRemove and Unload
> >routine. Whwn HCT try to "insert" device, the device
> >manager shows :"Windows cannot load the device driver
> for
> >this hardware because a previous instance of the device
> >driver is still in memory. (Code 38)". Why?
> >
> >.
> >
>
> After I restart computer and restart HCT, every thing is
> OK! But it's not acceptable. It must work normally on the
> first run of HCT. Help me!

Or, it could also be because your driver is not unloading properly during
the Surprise Removal, and therefore it can't load again when it's
reconnected.

Thanks,
Karl

"Andy Wen [MSFT]" <______@online.microsoft.com> wrote in message
news:3f39757f$1@news.microsoft.com...
> This could due to improper reference count or an race between load and
> unload operations. Or the driver was referenced multiple time by the
device.
>
>
> "steven" <stevenl2003@hotmail.com> wrote in message
> news:071b01c358ca$ad6c9b80$a301280a@phx.gbl...
> >
> > >-----Original Message-----
> > >My driver is for usb device. I try to test
> > >surpriseremove. HCT simulates unpluging device. My
> > driver
> > >steps into PnpSurpriseRemove, PnpRemove and Unload
> > >routine. Whwn HCT try to "insert" device, the device
> > >manager shows :"Windows cannot load the device driver
> > for
> > >this hardware because a previous instance of the device
> > >driver is still in memory. (Code 38)". Why?
> > >
> > >.
> > >
> >
> > After I restart computer and restart HCT, every thing is
> > OK! But it's not acceptable. It must work normally on the
> > first run of HCT. Help me!
>
>