Re: ide-cd vs. DMA

[Alan Cox]

On Maw, 2005-05-24 at 04:24, Benjamin Herrenschmidt wrote:
> Well, not sure what's wrong here, but ATAPI errors shouldn't normally
> result in stopping DMA. We may want to just blacklist your drive rather
> than having this stupid fallback. In this case, I suspect it's
> CSS/region issue with a DVD.

The fallback should only be triggering on a DMA CRC error. Turning DMA
off or using ide-scsi works (as generally does using the -ac kernel
tree) because that handles partial completions correctly while readahead
caused errors break the base ide-cd driver badly.

I would suggest avoiding the ide-cd driver in the base kernel for most
purposes, at least until that bug and the "rmmod cache flush" bug are
fixed.

Alan

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