> > I'd say this is a non-starter. It solves nothing and means PIO in libata
> > is still basically unusable.
> 
> It doesn't solve the problem completely but still helps, FWIW.  I was

Most transfers for PIO are a single 512 byte transfer per command.

> hoping we could lock only for the last transfer (word).  Would it
> complicate ->data_xfer() too much?

I don't think so. We need to complicate it far more to add 32bit
transfers. We also only have a few ->data_xfer implementations so its
easy to propogate the chance.

Why do we need the lock on the last word transferred anyway. I'm missing
a detail here ?
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