Jarek Poplawski wrote:
> (Changelog fixed only)
> 
> pkt_sched: sch_drr: Fix drr_dequeue() loop
> 
> If all child qdiscs of sch_drr are non-work-conserving (e.g. sch_tbf)
> drr_dequeue() will busy-loop waiting for skbs instead of leaving the
> job for a watchdog. Checking for list_empty() in each loop isn't
> necessary either, because this can never be true except the first time.

Thanks for the report. I don't like to overcomplicate treatment
of this broken configuration though, so this patch simply returns
NULL when the inner qdiscs is non-work-conserving.