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

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Message-ID: <orbpxuwu7o.fsf@oliva.athome.lsd.ic.unicamp.br>
Date:	Wed, 08 Oct 2008 20:19:39 -0300
From:	Alexandre Oliva <oliva@....ic.unicamp.br>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	linux-kernel@...r.kernel.org
Subject: Avoid I/O errors when issuing SCSI ioctls to JMicron USB/ATA bridge

Hi, Alan,

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=01 Cnt=01 Dev#=  2 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=152D20329000
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



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}