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

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Message-ID: <20080804142831.GW8749@boogie.lpds.sztaki.hu>
Date:	Mon, 4 Aug 2008 16:28:32 +0200
From:	Gabor Gombas <gombasg@...aki.hu>
To:	Tejun Heo <htejun@...il.com>
Cc:	Elias Oltmanns <eo@...ensachen.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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 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.

Gabor

-- 
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     MTA SZTAKI Computer and Automation Research Institute
                Hungarian Academy of Sciences
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