usbd does not use detach

[M. Warner Losh]

In message: <200308150901.35745.doconnor at gsoft.com.au>
            "Daniel O'Connor" <doconnor at gsoft.com.au> writes:
: It should also have a hint to indicate that this device could potentially go 
: away at any time, so it shouldn't cache anything if at all possible.
: (Although it would be good if the user could elect to override this in the 
: interests of performance)
: 
: I suspect that would require more significant changes though :)

I suspect that this would be as hard to implement as dealing with
things going away, and produce a system that is less desirable to
use.

Warner