Hello,
Starting with Linux 2.6.8.1, I'm getting SCSI errors 0x10070000
when accessing my USB flash MP3 player. This I/O error occurs while
transferring the first few blocks on every attempt to read or write
files. Listing directories is still possible.
I have tracked these errors to the checks for data underflow in
drivers/usb/storage/transport.c. After backing out the code which
checks for underflow, my drive was accessible again.
These checks were introduced in Linux 2.6.8 as a patch titled
"[PATCH] USB: Patch to signal underflow in usb-storage driver".
I don't know enough about SCSI/USB to tell whether my errors are caused
by my USB device messing up, or by the Linux transport routines being too
strict in their checking.
Could someone who understands such things please take a look at this ?
My USB device is a MamboX flash drive / MP3 player.
vendor: 0x03eb "Atmel Corp."
product: 0x2002 "MusicDrive"
The code which raises the error is in drivers/usb/storage/transport.c,
line 715:
---
/* Did we transfer less than the minimum amount required? */
if (srb->result == SAM_STAT_GOOD &&
srb->request_bufflen - srb->resid < srb->underflow)
srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);
---
A fragment from my dmesg which shows the problem:
----
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: Generic Model: MusicDrive Rev: 0.00
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 256000 512-byte hdwr sectors (131 MB)
sda: Write Protect is off
sda: Mode Sense: 1b 00 00 00
sda: assuming drive cache: write through
sda: sda1
Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
USB Mass Storage device found at 2
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
SCSI error : <0 0 0 0> return code = 0x10070000
end_request: I/O error, dev sda, sector 107
Buffer I/O error on device sda1, logical block 0
---
Bye,
Joris.
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