> It's odd that the two types of hardware treat the interrupt case where
> interval == 0 differently. Is either of them wrong by the specification
> or are they both right? 

My take is that the interval==0 behavior is a UHCI driver behavior
that should not be relied on.  Magic values like that are trouble.

The portable way to get a one-shot interrupt transfer should be
to submit the transfer as usual (real period) then unlink it in the
completion handler for that transfer.




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