No, it is not polling for completion.
Completion is signaled by a hardware interrupt,
and the CPU is elsewhere until that happens.
> completion (yes, the interrupts are enabled so something else could
> use the CPU). Any problem with locking, that could prevent these
> I/O operations from being atomic can cause problems.
>
> Since enabling interrupts during the PIO operation was a bad_thing(tm),
On only a couple of systems (other than cmd640 and rz1000 systems).
It is a Good Thing(tm) on all others. The default is "off" for safety.
-- mlord@pobox.com The (ex-)Linux IDE guy- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.altern.org/andrebalsa/doc/lkml-faq.html