linux-kernel - Re: [PATCH] libata: add human-readable error value decoding

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Date:	Fri, 11 May 2007 19:11:09 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Chuck Ebbert <cebbert@...hat.com>
CC:	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: [PATCH] libata: add human-readable error value decoding

Chuck Ebbert wrote:
> Robert Hancock wrote:
>>>> +          ehc->i.serror & SERR_TRANS_ST_ERROR ? "TransStatTransErr "
>>>> : "",
>>>> +          ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecogFIS " : "",
>>>> +          ehc->i.serror & SERR_DEV_XCHG ? "DevExchanged " : "" );
>>> I'm not really convinced whether this is necessary.  The human readable
>>> form is also a bit cryptic and can get quite long.  So, mild NACK from
>>> me.
>>>
>> It certainly seems useful when debugging hotplug issues or random SATA
>> problems which end up being caused by communication problems. Without
>> this output, Joe User stands no chance of figuring out what's going on,
>> and neither does Joe libata Developer unless they really care to dig
>> through the spec and count bits to figure out what they mean. At least
>> with this you can see that there was a CRC error, etc. and go from that..
>>
> 
> Why not just document the error messages?
> 
> And the scsi ones too, I can't seem to find what the sense codes mean.

They are well documented elsewhere - the standard documents.  For sense
codes, t10.org.  For SError bits, t13.org.  You can get drafts free of
charge.

-- 
tejun
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