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

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Date:	Thu, 4 Sep 2008 09:09:34 -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

Ok, I looked into this a little bit further...

K3B provides an interesting log:

first, this is repeated 3 times:

(K3bDevice::ScsiCommand) failed:
                           command:    MODE SELECT (55)
                           errorcode:  70
                           sense key:  ILLEGAL REQUEST (5)
                           asc:        26
                           ascq:       0

then it shows:

(K3bDevice::ScsiCommand) failed:
                           command:    GET PERFORMANCE (ac)
                           errorcode:  0
                           sense key:  NO SENSE (2)
                           asc:        0
                           ascq:       0
(K3bDevice::Device) /dev/scd0: GET PERFORMANCE length det failed.

And then all commands from then on fail

strace indicate this is sent via SG_IO IOCTL (unfortunatelly, strace
doen't show the contents in the ioctl)

I don't know if the device is supposed to stop working when receiving
an unkown command (like it is apparently doing), also because
apparently cdrecord doesn't send this command but fails anyway

-- 
-
Thiago Galesi
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