linux-kernel - Re: [PATCH] JMicron JM20337 USB-SATA data corruption bugfix

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Message-ID: <20080722061147.GB8303@notebook.homenet.local>
Date:	Tue, 22 Jul 2008 08:11:47 +0200
From:	Tomas Styblo <tripie@...n.org>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	usb-storage@...ts.one-eyed-alien.net,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH] JMicron JM20337 USB-SATA data corruption bugfix -
	device 152d:2338

* Robert Hancock <hancockr@...w.ca> [Tue, 22 Jul 2008]:
>
> In any case, given that your code apparently fixes the corruption it seems 
> that srb->result is being set to SAM_STAT_CHECK_CONDITION, but the 
> DID_ERROR and SUGGEST_RETRY flags are not being set. Presumably then the  
> SCSI layer looks at the sense data and says "hmm, nothing to worry about 
> here" and carries on.

That's exactly what I thought was happening, after a cursory 
look at the SCSI code.

>
> I think we do need something like your patch, though it should likely be 
> moved inside the if (need_auto_sense) check, and I don't see a reason to 
> limit to this device ID only.

Thank you. This is a very insidious bug as it doesn't manifest
itself very often, months of data corruption may pass before you
notice it.

So is there a bug in the chipset, or does the error handling code 
not follow specifications?

I wonder if the company that makes the chipset should be notified
about this problem?


-- 
Tomas Styblo <tripie@...n.org>
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