Here is some call trace comming from usb_stor_transfer_length():
.config & result od lsusb -v are attached.



drivers/usb/core/hub.c: new USB device 02:06.1-2, assigned address 2
scsi1 : SCSI emulation for USB Mass Storage devices
    Vendor:           Model:                   Rev:
    Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
USB len=128, request_bufflen=24
Call Trace:
   [<c02115a7>] usb_stor_transfer_length+0x1a7/0x1c0
   [<c0212049>] usb_stor_Bulk_transport+0x19/0x270
   [<c011533f>] schedule+0x37f/0x410
   [<c011550e>] __wake_up_locked+0xe/0x20
   [<c0211a5d>] usb_stor_invoke_transport+0x1d/0x230
   [<c02113bd>] usb_stor_transparent_scsi_command+0xcd/0x110
   [<c0212be2>] usb_stor_control_thread+0x442/0x540
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c010724d>] ret_from_fork+0x5/0x14
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c0105528>] kernel_thread_helper+0x0/0x18
   [<c010552d>] kernel_thread_helper+0x5/0x18

USB len=128, request_bufflen=24
Call Trace:
   [<c02115a7>] usb_stor_transfer_length+0x1a7/0x1c0
   [<c0211919>] usb_stor_transfer+0x19/0x140
   [<c0212175>] usb_stor_Bulk_transport+0x145/0x270
   [<c011533f>] schedule+0x37f/0x410
   [<c0211a5d>] usb_stor_invoke_transport+0x1d/0x230
   [<c02113bd>] usb_stor_transparent_scsi_command+0xcd/0x110
   [<c0212be2>] usb_stor_control_thread+0x442/0x540
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c010724d>] ret_from_fork+0x5/0x14
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c0105528>] kernel_thread_helper+0x0/0x18
   [<c010552d>] kernel_thread_helper+0x5/0x18

usb_stor_clear_halt() WORKED!
USB len=128, request_bufflen=24
Call Trace:
   [<c02115a7>] usb_stor_transfer_length+0x1a7/0x1c0
   [<c0212049>] usb_stor_Bulk_transport+0x19/0x270
   [<c011533f>] schedule+0x37f/0x410
   [<c011550e>] __wake_up_locked+0xe/0x20
   [<c0211a5d>] usb_stor_invoke_transport+0x1d/0x230
   [<c02113bd>] usb_stor_transparent_scsi_command+0xcd/0x110
   [<c0212be2>] usb_stor_control_thread+0x442/0x540
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c010724d>] ret_from_fork+0x5/0x14
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c0105528>] kernel_thread_helper+0x0/0x18
   [<c010552d>] kernel_thread_helper+0x5/0x18
USB len=128, request_bufflen=24
Call Trace:
   [<c02115a7>] usb_stor_transfer_length+0x1a7/0x1c0
   [<c0211919>] usb_stor_transfer+0x19/0x140
   [<c0212175>] usb_stor_Bulk_transport+0x145/0x270
   [<c011533f>] schedule+0x37f/0x410
   [<c0211a5d>] usb_stor_invoke_transport+0x1d/0x230
   [<c02113bd>] usb_stor_transparent_scsi_command+0xcd/0x110
   [<c0212be2>] usb_stor_control_thread+0x442/0x540
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c010724d>] ret_from_fork+0x5/0x14
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c0105528>] kernel_thread_helper+0x0/0x18
   [<c010552d>] kernel_thread_helper+0x5/0x18

usb_stor_clear_halt() WORKED!
USB len=128, request_bufflen=24
Call Trace:
   [<c02115a7>] usb_stor_transfer_length+0x1a7/0x1c0
   [<c0212049>] usb_stor_Bulk_transport+0x19/0x270
   [<c011533f>] schedule+0x37f/0x410
   [<c011550e>] __wake_up_locked+0xe/0x20
   [<c0211a5d>] usb_stor_invoke_transport+0x1d/0x230
   [<c02113bd>] usb_stor_transparent_scsi_command+0xcd/0x110
   [<c0212be2>] usb_stor_control_thread+0x442/0x540
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c010724d>] ret_from_fork+0x5/0x14
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c0105528>] kernel_thread_helper+0x0/0x18
   [<c010552d>] kernel_thread_helper+0x5/0x18

USB len=128, request_bufflen=24
Call Trace:
   [<c02115a7>] usb_stor_transfer_length+0x1a7/0x1c0
   [<c0211919>] usb_stor_transfer+0x19/0x140
   [<c0212175>] usb_stor_Bulk_transport+0x145/0x270
   [<c011533f>] schedule+0x37f/0x410
   [<c0211a5d>] usb_stor_invoke_transport+0x1d/0x230
   [<c02113bd>] usb_stor_transparent_scsi_command+0xcd/0x110
   [<c0212be2>] usb_stor_control_thread+0x442/0x540
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c010724d>] ret_from_fork+0x5/0x14
   [<c02127a0>] usb_stor_control_thread+0x0/0x540
   [<c0105528>] kernel_thread_helper+0x0/0x18
   [<c010552d>] kernel_thread_helper+0x5/0x18

usb_stor_clear_halt() WORKED!
sda : MODE SENSE failed.
sda : status = 1, message = 00, host = 0, driver = 08
Info fld=0x0, Current sd00:00: sense key Not Ready
Additional sense: Medium not present
sda : assuming drive cache: write through
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 2