linux-kernel - Re: Stardom SATA HSM violation

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Message-ID: <46FB563A.80108@gmail.com>
Date:	Thu, 27 Sep 2007 16:05:30 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Mark Lord <liml@....ca>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	michal.k.k.piotrowski@...il.com, bryan@...ores.ca,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: Stardom SATA HSM violation

Mark Lord wrote:
> Tejun Heo wrote:
>> Hello,
>>
>> Mark Lord wrote:
>>> I reported a very similar bug back a few releases ago.
>>> Anyone who wants to try it themselves, can do this with hdparm-7.7 (from
>>> sourceforge):
>>>
>>>    hdparm --drq-hsm-error /dev/sda
>>>
>>> Whether or not it hangs the machine does depend upon exactly which SATA
>>> LLD is used,
>>> and what model/revision of drive is installed.  But if it hangs for you
>>> (eg. Tejun),
>>> then you now have a way to reproduce a HSM error "on demand" for
>>> testing.  :)
>>
>> Neat.  Is this the FIFO-draining issue?
> 
> Yeah, that's the one.  And I still patch my own kernels to
> automatically drain up to 512 words from the FIFO when this happens.
> 
> Works like a charm.  Patch below for demonstration purposes.
> 
> Signed-Off-By:  Mark Lord <mlord@...ox.com>

I think there have been enough cases where this draining was necessary.
 IIRC, ata_piix was involved in those cases, right?  If so, can you
please submit a patch which applies this only to affected controllers?
I don't feel too confident about applying this to all SFF controllers.

Thanks.

-- 
tejun

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