linux-kernel - Re: READ SCSI cmd seems to fail on SATA optical devices...

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Message-ID: <455B3A78.7010503@gmail.com>
Date:	Thu, 16 Nov 2006 01:04:08 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Mathieu Fluhr <mfluhr@...o.com>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Phillip Susi <psusi@....rr.com>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: READ SCSI cmd seems to fail on SATA optical devices...

Mathieu Fluhr wrote:
> On Wed, 2006-11-15 at 02:24 +0900, Tejun Heo wrote:
>>> ... and the problem is not in accessing the device itself (this is
>>> working like a charm) but understanding why a SCSI READ(10) cmd
>>> sometimes fails as a ATA-padded READ(10) cmd - as discribed in the
>> Annex
>>> A of the MMC-5 spec - ALWAYS works.
>>> -> I would suspect somehow a synchronisation problem somehow in the
>>> translation of SCSI to ATA command...
>> Can you try the attached patch and see if anything changes?
>>
> 
> The patch _seems_ to solve my problem. I am just really astonished when
> I read the diff file :D. Can I expect that it will be merged to the
> official kernel sources ?

It seems that some devices choke when the bytes after CDB contain 
garbage.  I seem to recall that I read somewhere ATAPI device require 
left command bytes cleared to zero but I can't find it anywhere now. 
Maybe I'm just imagining.  Anyways, yeah, I'll push it to upstream.

-- 
tejun
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