David Brownell wrote:
> By the way, re the $SUBJECT patch ... is there a bugfix in there,
> or is this just trying to be some kind of cleanup?
>
no there's no fix, only cleanup.
>
> On Wednesday 28 June 2006 12:47 am, Franck Bui-Huu wrote:
>
>> It seems that a call to usb_unlink_urb() doesn't always mean that the URB
>> has completed.
>
> That's how it's specified, yes. It's an asynchronous completion,
> just like usb_submit_urb(). Both can be called from IRQ handlers,
> and unlinking will at most accelerate the urb completion callback.
>
> If you want a synchronous unlink, usb_kill_urb() is the solution.
>
>
>> Is it due to the HCD that can't always complete the URB when
>> calling its urb_dequeue() method ?
>
> More like the controller needs time to finish its processing. It
> may be part way through some DMA transfers for that URB, and need
> to shut them down. And then it probably takes a while to trigger
> the IRQ telling the HCD to pick up the pieces.
>
thanks for the explanations.
Franck
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