Ming Lei wrote:
> On Fri, Jul 19, 2013 at 1:44 AM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote:
>> In any case, there must be _some_ mechanism to explicitly restart
>> a stream. I do not really care if this is some URB flag or some
>> function call.
>
> Thought about the problem further, looks there is one simple
> approach for detecting underrun in case of empty queue:
>
> if (list_empty (&stream->td_list)) {
> if (running from hcd interrupt or tasklet context)
> underrun
> else
> new stream
> }
Why shouldn't a driver start a stream in an interrupt/tasklet,
or delay URB resubmission to a workqueue?
Regards,
Clemens
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