linux-kernel - Re: Avoid I/O errors when issuing SCSI ioctls to JMicron USB/ATA bridge

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Date:	Sun, 19 Oct 2008 02:11:33 -0200
From:	Alexandre Oliva <oliva@....ic.unicamp.br>
To:	Phil Dibowitz <phil@...m.com>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: Re: Avoid I/O errors when issuing SCSI ioctls to JMicron USB/ATA bridge

On Oct 14, 2008, Phil Dibowitz <phil@...m.com> wrote:

> The patch looks generally good, but you've included every possible revision
> of the hardware. Can you please change your patch to include just the
> revision in question (0x0100) rather than the whole range (0x0000 - 0x9999)?

Here's the patch.  Let's hope that's enough to cover any other
failing variants, past, present and future.


>> Here's the patch that implements the fix you suggested to avoid the
>> I/O errors that I was running into with my new USB enclosure with a
>> JMicron USB/ATA bridge, while issuing scsi-io USN or other such
>> queries used by Fedora's mkinitrd.
>> http://bugzilla.kernel.org/show_bug.cgi?id=9638#c85


/proc/bus/usb/devices:
T:  Bus=01 Lev=01 Prnt=01 Port=07 Cnt=04 Dev#=  5 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=152d ProdID=2329 Rev= 1.00
S:  Manufacturer=JMicron
S:  Product=USB to ATA/ATAPI Bridge
S:  SerialNumber=DE5088854FFF
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=  2mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

(patch applied and retested on a modified 2.6.27.2-libre.24.rc1.fc10)


View attachment "lxo-usb-jmicron-ignore-residue.patch" of type "text/x-patch" (802 bytes)


-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Free Software Evangelist  oliva@...d.ic.unicamp.br, gnu.org}
FSFLA Board Member       ¡Sé Libre! => http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@...dhat.com, gcc.gnu.org}