> An ISR would be part of the HCD ... so my earlier comments
> apply. That can't work. And the work doesn't actually need
> to be done in_irq(), fwiw.
>
> > Thus, doing it with a flag (and both the urb->dev and the
> > urb->status methods are effectively flags) is difficult
>
> "not possible" ... as with the "urb->users" flag you sketch.
> The race begins when such a flag's value changes (in the
> hcd parts of usbcore) and ends when the completion routine
> finishes its work on the URB.
But the decrementing of the counter would be the last thing
the isr does. I am probably dense here. Could you explain
the race in greater detail ?
Regards
Oliver
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