NdisDeregisterAdapter not returned

From: jihuanglee (jihuanglee_at_gmail.com)
Date: 12/29/04 

Date: 29 Dec 2004 00:33:06 -0800

Hello

I am developing a NDIS usb driver(miniport). When I unplugged the
device, I got the USB notification function. Then I called
NdisDeregisterAdapter to release the NDIS adapter. But
NdisDeregisterAdapter seemed to hang and not returned.
Does anybody know what may happen inside the NdisDeregisterAdapter
function?

PS. I have checked that there was not any packet or OID pending.

Thanks very much