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: <20080310190158.GI2820@one-eyed-alien.net>
Date:	Mon, 10 Mar 2008 12:01:58 -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

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

You were using cheat codes too.  You guys suck.
					-- Greg to General Studebaker
User Friendly, 12/16/1997

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