Re: [PATCH 2.6.25-rc4] usb: add support for Motorola ROKR Z6 cellphonein mass storage mode

[Constantin Baranov]

Yes. These three flags corresponds to three different bugs
discussed in linux-usb-users@xxxxxxxxxxxxxxxxxxxxx
(http://www.mail-archive.com/linux-usb-users@xxxxxxxxxxxxxxxxxxxxx/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@xxxxxxxx>
>>
>> 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@xxxxxxxx>
>> ---
>>  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@xxxxxxxx>
>> + * 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@xxxxxxxxxxxxxxxxxxxxxxxx> */
>>  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 ,
>>
>> --
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> 

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