linux-kernel - Re: "Fix ATAPI transfer lengths" causes CD writing regression

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Message-ID: <20071031114958.210bd7cc@the-village.bc.nu>
Date:	Wed, 31 Oct 2007 11:49:58 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Daniel Drake <dsd@...too.org>
Cc:	linux list <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: "Fix ATAPI transfer lengths" causes CD writing regression

On Tue, 30 Oct 2007 19:21:29 +0000
Daniel Drake <dsd@...too.org> wrote:

> Alan Cox wrote:
> > I would guess Brasero is issuing a command with the length of data
> > wrongly set. In the old code that might well just produce errors of the
> > "Umm wtf is this data left over for ?", with the new code the drive is
> > likely to change state as it knows the transfer size and that will
> > *correctly* cause an HSM error and what follows.
> > 
> > Now the question is who gets the length wrong - Brasero or the ata
> > translation code in libata
> 
> Brasero does exactly the same as my test app which I attached to my last 
> mail. Is my test app wrong?

Would need to double check the SCSI specificatons to be sure but I think
you are asking for less data than the drive wishes to provide. You
aren't allowed to do that with ATA.

Alan
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