surpriseremove test error

[steven]

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?

 

[steven]

-----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!

 

[Andy Wen [MSFT]]

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.

 

[Karl Foose [MSFT]]

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