> I think there have been enough cases where this draining was necessary.
> IIRC, ata_piix was involved in those cases, right? If so, can you
> please submit a patch which applies this only to affected controllers?
> I don't feel too confident about applying this to all SFF controllers.
Old IDE does it on all controllers bar a couple. So we have a very good
knowledge of what does/doesn't work. The one that needs care in old ide
is an ordering issue where a state machine reset done first causes the
drain of the I/O to hang.
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