> I know all these difference clearly, inc_deq() is indeed a common
> function for different rings, but lasr_trb() & last_trb_on_last_seg()
> inside it use different condition to determine the last trb in an
> event ring and an non-event ring; and sorry, i still not find why last
> trb in an event ring skipped by H/W according to the current logic.
>
> Thanks!
>
Read the specs and the code.
David
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