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Subject[PATCH 2.6.25-rc4] usb: add support for Motorola ROKR Z6 cellphone in mass storage mode
From: Constantin Baranov <const@tltsu.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@tltsu.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@tltsu.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@kassiopeia.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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