linux-kernel - Re: [PATCH 2.6.25-rc4] usb: add support for Motorola ROKR Z6 cellphone in mass storage mode

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Message-ID: <20080311063019.GA1756@one-eyed-alien.net>
Date:	Mon, 10 Mar 2008 23:30:19 -0700
From:	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>
To:	Constantin Baranov <const@...st.mimas.ru>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.25-rc4] usb: add support for Motorola ROKR Z6 cellphone in mass storage mode

One last question:

If it's a ROKR Z6, why does the string in unusual_devs.h say "MSnc."?

Matt

On Mon, Mar 10, 2008 at 11:52:19PM +0400, Constantin Baranov wrote:
> Yes. These three flags corresponds to three different bugs
> discussed in linux-usb-users@...ts.sourceforge.net
> (http://www.mail-archive.com/linux-usb-users@lists.sourceforge.net/msg19167.html)
> 
> FIX_INQUIRY: Device always sends PQ=1 in inquiry data, so SCSI subsystem
> stops to create sd device.
> FIX_CAPACITY: Device tells wrong size of internal memory card
> (real size + 1). If one would try to read/write "phantom" sector then
> phone hang up and reboot.
> BULK_IGNORE_TAG: Sometimes device sends wrong tags causing computer to
> reset endpoint. This may corrupt phone's filesystem in particular.
> 
> Matthew Dharm wrote:
> > Are all 3 flags truly needed?
> > 
> > Matt
> > 
> > On Mon, Mar 10, 2008 at 10:39:06PM +0400, Constantin Baranov wrote:
> >> From: Constantin Baranov <const@...su.ru>
> >>
> >> Motorola ROKR Z6 cellphone has bugs in its USB, so it is impossible to use
> >> it as mass storage. Patch describes new "unusual" USB device for it with
> >> FIX_INQUIRY and FIX_CAPACITY flags and new BULK_IGNORE_TAG flag.
> >> Last flag relaxes check for equality of bcs->Tag and us->tag in
> >> usb_stor_Bulk_transport routine.
> >>
> >> Signed-off-by: Constantin Baranov <const@...su.ru>
> >> ---
> >>  drivers/usb/storage/transport.c    |    3 ++-
> >>  drivers/usb/storage/unusual_devs.h |   10 ++++++++++
> >>  include/linux/usb_usual.h          |    4 +++-
> >>  3 files changed, 15 insertions(+), 2 deletions(-)
> >>
> >> diff -upr linux-2.6.25-rc4/drivers/usb/storage/transport.c
> >> linux-2.6.25-rc4-motorokr_z6/drivers/usb/storage/transport.c
> >> --- linux-2.6.25-rc4/drivers/usb/storage/transport.c	2008-03-10
> >> 22:09:11.000000000 +0400
> >> +++ linux-2.6.25-rc4-motorokr_z6/drivers/usb/storage/transport.c
> >> 2008-03-10 22:11:24.000000000 +0400
> >> @@ -1009,7 +1009,8 @@ int usb_stor_Bulk_transport(struct scsi_
> >>  	US_DEBUGP("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",
> >>  			le32_to_cpu(bcs->Signature), bcs->Tag,
> >>  			residue, bcs->Status);
> >> -	if (bcs->Tag != us->tag || bcs->Status > US_BULK_STAT_PHASE) {
> >> +	if (!(bcs->Tag == us->tag || (us->flags & US_FL_BULK_IGNORE_TAG)) ||
> >> +		bcs->Status > US_BULK_STAT_PHASE) {
> >>  		US_DEBUGP("Bulk logical error\n");
> >>  		return USB_STOR_TRANSPORT_ERROR;
> >>  	}
> >> diff -upr linux-2.6.25-rc4/drivers/usb/storage/unusual_devs.h
> >> linux-2.6.25-rc4-motorokr_z6/drivers/usb/storage/unusual_devs.h
> >> --- linux-2.6.25-rc4/drivers/usb/storage/unusual_devs.h	2008-03-10
> >> 22:09:11.000000000 +0400
> >> +++ linux-2.6.25-rc4-motorokr_z6/drivers/usb/storage/unusual_devs.h
> >> 2008-03-10 22:10:40.000000000 +0400
> >> @@ -1589,6 +1589,16 @@ UNUSUAL_DEV(  0x22b8, 0x4810, 0x0001, 0x
> >>  		US_SC_DEVICE, US_PR_DEVICE, NULL,
> >>  		US_FL_FIX_CAPACITY),
> >>
> >> +/*
> >> + * Patch by Constantin Baranov <const@...su.ru>
> >> + * Report by Andreas Koenecke
> >> + */
> >> +UNUSUAL_DEV(  0x22b8, 0x6426, 0x0101, 0x0101,
> >> +		"Motorola",
> >> +		"MSnc.",
> >> +		US_SC_DEVICE, US_PR_DEVICE, NULL,
> >> +		US_FL_FIX_INQUIRY | US_FL_FIX_CAPACITY | US_FL_BULK_IGNORE_TAG),
> >> +
> >>  /* Reported by Radovan Garabik <garabik@...siopeia.juls.savba.sk> */
> >>  UNUSUAL_DEV(  0x2735, 0x100b, 0x0000, 0x9999,
> >>  		"MPIO",
> >> diff -upr linux-2.6.25-rc4/include/linux/usb_usual.h
> >> linux-2.6.25-rc4-motorokr_z6/include/linux/usb_usual.h
> >> --- linux-2.6.25-rc4/include/linux/usb_usual.h	2008-03-10
> >> 22:09:12.000000000 +0400
> >> +++ linux-2.6.25-rc4-motorokr_z6/include/linux/usb_usual.h	2008-03-10
> >> 22:10:40.000000000 +0400
> >> @@ -50,7 +50,9 @@
> >>  	US_FLAG(CAPACITY_HEURISTICS,	0x00001000)		\
> >>  		/* sometimes sizes is too big */		\
> >>  	US_FLAG(MAX_SECTORS_MIN,0x00002000)			\
> >> -		/* Sets max_sectors to arch min */
> >> +		/* Sets max_sectors to arch min */		\
> >> +	US_FLAG(BULK_IGNORE_TAG,0x00004000)			\
> >> +		/* Ignore tag mismatch in bulk operations */
> >>
> >>
> >>  #define US_FLAG(name, value)	US_FL_##name = value ,
> >>
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> >> the body of a message to majordomo@...r.kernel.org
> >> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 

-- 
Matthew Dharm                              Home: mdharm-usb@...-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

G:  Money isn't everything, A.J.
AJ: Who convinced you of that?
G:  The Chief, at my last salary review.
					-- Mike and Greg
User Friendly, 11/3/1998

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