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Message-ID: <20080311150040.GB1756@one-eyed-alien.net>
Date: Tue, 11 Mar 2008 08:00:40 -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
That's reasonable. But you should then update the comment in
unusual_devs.h so that people looking at the file know it's for the ROKR
Z6.
If you change that, I'll sign off on the patch.
Matt
On Tue, Mar 11, 2008 at 11:02:35AM +0400, Constantin Baranov wrote:
> I have just copied identification strings from the phone.
> FIX_INQUIRY causes kernel to use vendor/product strings from
> unusual_devs.h instead of from device's inquiry data.
> And I'd like not to change the reality without any reason.
>
> Matthew Dharm wrote:
> > 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
What, are you one of those Microsoft-bashing Linux freaks?
-- Customer to Greg
User Friendly, 2/10/1999
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