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

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Date:	Tue, 2 Sep 2008 17:16:22 -0300
From:	"Thiago Galesi" <thiagogalesi@...il.com>
To:	"Alan Stern" <stern@...land.harvard.edu>
Cc:	"Alex Buell" <alex.buell@...ted.org.uk>,
	linux-kernel@...r.kernel.org, "Robert Hancock" <hancockr@...w.ca>,
	"Tomas Styblo" <tripie@...n.org>, linux-usb@...r.kernel.org,
	usb-storage@...ts.one-eyed-alien.net
Subject: Re: [PATCH] JMicron JM20337 USB-SATA data corruption bugfix - device 152d:2338

Hello

>
> I can't tell exactly what's happening, but your device is sending back
> a lot of error messages (Not Ready - Medium not present).  Maybe it
> doesn't recognize the type of disc you have loaded. Also, there appears to be some program querying the state of your
> device 7 or 8 times every two seconds.

Ok, I suspect what this may be, and I'll disable it, hopefully
producing a cleaner log.

> However what finally caused the failure was a command (0xAC) which I
> don't recognize and apparently your drive doesn't recognize either.

Is this it? dfbb5d80 1845367929 C Bi:6:002:1 0 13 = 55534253 acc90100
00000000 00

Any idea who may be sending this? I mean,  can this be send via a
simple IOCTL to /dev/sr0 or it is something else?
Maybe stracing the program would be a good idea.

If I were to place a trace inside a driver, were would it be better?
sr_mod, sd_mod, usb-storage, cdrom? or somewhere else?

Thank you

-- 
-
Thiago Galesi
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