On Wed, 27 Jun 2007 03:35:26 -0400 Jeff Garzik <[EMAIL PROTECTED]> wrote:

> +     /* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
> +      * few ATAPI devices choke on such DMA requests.
> +      */
> +     if (unlikely(qc->nbytes & 15))
> +             return 1;

It might be worth emitting a diagnostic when this happens.
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