linux-kernel - Re: [PATCH 1/1] pata_it821x: fix lost interrupt with atapi devices

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Message-ID: <20070918091400.GC13425@devserv.devel.redhat.com>
Date:	Tue, 18 Sep 2007 05:14:00 -0400
From:	Alan Cox <alan@...hat.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jeff Garzik <jeff@...zik.org>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mikael Pettersson <mikpe@...uu.se>,
	Jeff Norden <jeff@...h.tntech.edu>, alan@...hat.com,
	linux-kernel@...r.kernel.org, Albert CC Lee <albertcc@...ibm.com>,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH 1/1] pata_it821x: fix lost interrupt with atapi devices

On Mon, Sep 17, 2007 at 01:46:01PM +0200, Tejun Heo wrote:
> failures and would really like to know what's broken.  The reason can be
> one of the following two.
> 
> 1. libata itself isn't doing anything wrong but using SCSI for mid and
> high level drivers are causing problems as more types of commands are used.
> 
> 2. Mode programming for MWDMA is broken.  This doesn't seem too likely
> as we're seeing MWDMA failures across different low level drivers but is
> still a possibility.

3 and 4

3. Libata is wrong (it is in places)

4. Old IDE uses DMA much less for ATAPI especially
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