Date: Fri, 1 Aug 2008 23:34:59 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Tejun Heo <htejun@gmail.com>
Cc: Elias Oltmanns <eo@nebensachen.de>, Jeff Garzik <jeff@garzik.org>,
       Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
       James Bottomley <James.Bottomley@hansenpartnership.com>,
       Pavel Machek <pavel@ucw.cz>, linux-ide@vger.kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/5] libata: Implement disk shock protection support
Message-ID: <20080801233459.11e9b254@lxorguk.ukuu.org.uk>
In-Reply-To: <4892B8FE.1070400@gmail.com>
References: <87prp1kvyy.fsf@denkblock.local>
	<20080726062142.29070.10413.stgit@denkblock.local>
	<4892B8FE.1070400@gmail.com>
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> 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).  The only reliable way to abort in-flight commands are by
> issuing hardreset.  However, ATA reset protocol is not designed for
> quick recovery.  The machine is gonna hit the ground hard way before the
> reset protocol is complete.

Actually you cau can issue idle immediate on older ATA devices. I am not
clear if that was stuck back into the current accelerometer friendly
drives or not. Would need to check with IBLenovo

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