On 03/18/2010 06:23 PM, Alan Stern wrote:
On Thu, 18 Mar 2010, Jeff Garzik wrote:
Removing 61-option-modem-modeswitch.rules completely yields substantial
progress. A large number of SCSI commands are successfully processed,
eventually proceeding to a loop:
[non-looping initial bit]
hub 4-0:1.0: over-current change on port 7
usb 3-2: new full speed USB device using uhci_hcd and address 2
usb 3-2: New USB device found, idVendor=04e8, idProduct=6640
usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2: Product: SAMSUNG CDMA Technologies
usb 3-2: Manufacturer: SAMSUNG Electronics Bo.,Ltd.
cdc_acm 3-2:1.0: ttyACM0: USB ACM device
usbcore: registered new interface driver cdc_acm
cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters
usb 3-2: USB disconnect, address 2
usb 3-2: new full speed USB device using uhci_hcd and address 3
usb 3-2: New USB device found, idVendor=05c6, idProduct=1000
usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 3-2: Product: USB MMC Storage
usb 3-2: Manufacturer: Qualcomm, Incorporated
usb 3-2: SerialNumber: 000000000002
Initializing USB Mass Storage driver...
scsi6 : usb-storage 3-2:1.0
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
scsi 6:0:0:0: Direct-Access Qualcomm MMC Storrage 2.31 PQ: 0 ANSI: 2
sd 6:0:0:0: Attached scsi generic sg4 type 0
sd 6:0:0:0: [sdd] 3932161 512-byte logical blocks: (2.01 GB/1.87 GiB)
sd 6:0:0:0: [sdd] Write Protect is off
sd 6:0:0:0: [sdd] Assuming drive cache: write through
sd 6:0:0:0: [sdd] Assuming drive cache: write through
sdd: sdd1
sd 6:0:0:0: [sdd] Assuming drive cache: write through
sd 6:0:0:0: [sdd] Attached SCSI removable disk
[endless loop bit]
sd 6:0:0:0: [sdd] Media Changed
sd 6:0:0:0: [sdd] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 6:0:0:0: [sdd] Sense Key : Unit Attention [current]
sd 6:0:0:0: [sdd] Add. Sense: No additional sense information
sd 6:0:0:0: [sdd] CDB: Read(10): 28 00 00 3c 00 00 00 00 01 00
end_request: I/O error, dev sdd, sector 3932160
Buffer I/O error on device sdd, logical block 3932160
sd 6:0:0:0: [sdd] Assuming drive cache: write through
sd 6:0:0:0: [sdd] Assuming drive cache: write through
sdd: sdd1
This looks like a familiar firmware bug. Notice the sector number;
it's the very last one. Most likely this device reports that the
medium has one more sector than it really does have.
You didn't say which kernel produced this output; I kind of hope the
most recent 2.6.34 version would do a better job of error recovery.
The latest 2.6.34-rc1-git kernel, as of a couple hours ago, produced
that output. Sorry for the omission.
Regardless, you can work around the last-sector problem by loading
usb-storage with the module parameter "quirks=5c6:1000:f".
A more permanent solution would involve adding an entry to the
unusual_devs.h file in drivers/usb/storage/.
Thanks,
Jeff
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