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

[Chuck Ebbert <cebbert@redhat.com>]

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.