USB2 patches

[M. Warner Losh]

In message: <200902011922.16810.hselasky at c2i.net>
            Hans Petter Selasky <hselasky at c2i.net> writes:
: In your patch you remove all error checking! If the taskqueue system does not 
: have an API function that can tell if the taskqueue is being drained from 
: inside the taskqueue callback, the taskqueue system has to be modified! It 
: cannot replace the existing system like it is now!

Why does the taskqueue system need to provide that?  Why can't the
driver set a dying flag in the softc to communicate this fact to the
taskqueue tasks?

Warner