> > Note the usb_sg_request() handles that a bit differently. If the thread
> > doing the cancel ("unlink") wins, it succeeds and prevents the other
> > thread from starting to process the request.
>
> There's no question that usb_sg_request is cleaner in this respect.
OK, just to sound out options, let's look at this from a fundamental angle.
Do we need completion handlers? Can we just associate struct completion*
with an URB and save us a whole lot of problems?
Regards
Oliver
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