linux-kernel - Re: [PATCH 3/5] libata: Implement disk shock protection support

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Message-ID: <20080804151333.606eaaaf@lxorguk.ukuu.org.uk>
Date:	Mon, 4 Aug 2008 15:13:33 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Gabor Gombas <gombasg@...aki.hu>
Cc:	Tejun Heo <htejun@...il.com>, Elias Oltmanns <eo@...ensachen.de>,
	Jeff Garzik <jeff@...zik.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Pavel Machek <pavel@....cz>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] libata: Implement disk shock protection support

On Mon, 4 Aug 2008 16:28:32 +0200
Gabor Gombas <gombasg@...aki.hu> wrote:

> On Fri, Aug 01, 2008 at 04:19:26PM +0900, Tejun Heo wrote:
> 
> > However, SATA or not, there simply isn't a way to abort commands in ATA.
> >  Issuing random command while other commands are in progress simply is
> > state machine violation and there will be many interesting results
> > including complete system lockup (ATA controller dying while holding the
> > PCI bus).
> 
> A system lockup may be an acceptable compromise if that saves the
> hardware. Maybe the kernel should explicitely panic unless the
> controller/drive is known to be able to recover.

We've already been told that the accelerometer will now and then randomly
trigger due to other shock patterns like a bump. I don't want my laptop
to panic randomly on train journeys thank you.

Alan
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