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

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Date:	Tue, 18 Sep 2007 05:07:15 -0400
From:	Alan Cox <alan@...hat.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	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 07:00:03AM +0200, Tejun Heo wrote:
> I wonder whether we should be using similar check in generic path too.
> We have quite a few cases where MWDMA ATAPI devices choking on commands
> with small transfer sizes.  I don't think we'll experience significant
> performance regression with this applied and even if there is some, it's
> far better to have slightly slower working device.
> 
> What do you guys think?

I think to start with someone should fix the ATAPI state machine. Stick
a BUG() in the driver if dma start is called when the atapi command data 
size is zero

Alan

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