RE: [linux-usb-devel] Kernel unable to read partition table on US B Memory Key

["Roberts-Thomson, James" <James.Roberts-Thomson@NBNZ.CO.NZ>]

Alan,

>How about the patch below instead?  It's a bit easier to use, in that it 
>doesn't require users to know about a new parameter.  Also it retries at 
>1-second intervals for up to 5 seconds, which makes it a little more 
>flexible.  If this works for you, I'll submit it for inclusion in the 
>official kernel.

Thanks; this patch works nicely for me, as can be seen here (the two-second
delay occurs before "ready" below):

Jul 12 11:22:20 pc196344 kernel: usb 1-6: new high speed USB device using
ehci_hcd and address 12
Jul 12 11:22:20 pc196344 kernel: scsi9 : SCSI emulation for USB Mass Storage
devices
Jul 12 11:22:20 pc196344 kernel: usb-storage: device found at 12
Jul 12 11:22:20 pc196344 kernel: usb-storage: waiting for device to settle
before scanning
Jul 12 11:22:22 pc196344 kernel:   Vendor: OTi       Model: Flash Disk
Rev: 2.00
Jul 12 11:22:22 pc196344 kernel:   Type:   Direct-Access
ANSI SCSI revision: 02
Jul 12 11:22:24 pc196344 kernel: ready
Jul 12 11:22:24 pc196344 kernel: SCSI device sda: 255488 512-byte hdwr
sectors (131 MB)
Jul 12 11:22:24 pc196344 kernel: sda: Write Protect is off
Jul 12 11:22:24 pc196344 kernel: sda: Mode Sense: 03 00 00 00
Jul 12 11:22:24 pc196344 kernel: sda: assuming drive cache: write through
Jul 12 11:22:24 pc196344 kernel: SCSI device sda: 255488 512-byte hdwr
sectors (131 MB)
Jul 12 11:22:24 pc196344 kernel: sda: Write Protect is off
Jul 12 11:22:24 pc196344 kernel: sda: Mode Sense: 03 00 00 00
Jul 12 11:22:24 pc196344 kernel: sda: assuming drive cache: write through
Jul 12 11:22:24 pc196344 kernel:  /dev/scsi/host9/bus0/target0/lun0: p1
Jul 12 11:22:24 pc196344 kernel: Attached scsi removable disk sda at scsi9,
channel 0, id 0, lun 0
Jul 12 11:22:24 pc196344 kernel: Attached scsi generic sg2 at scsi9, channel
0, id 0, lun 0,  type 0
Jul 12 11:22:24 pc196344 kernel: usb-storage: device scan complete
Jul 12 11:22:24 pc196344 scsi.agent[27155]: disk at
/devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host9/target9:0:0/9:0:0:0
Jul 12 11:26:43 pc196344 kernel: usb 1-6: USB disconnect, address 12

Also, I checked with my older key, and as expected there was no problem
there either (patch had no effect):

Jul 12 11:26:55 pc196344 kernel: usb 4-2: new full speed USB device using
uhci_hcd and address 2
Jul 12 11:26:56 pc196344 kernel: scsi10 : SCSI emulation for USB Mass
Storage devices
Jul 12 11:26:56 pc196344 kernel: usb-storage: device found at 2
Jul 12 11:26:56 pc196344 kernel: usb-storage: waiting for device to settle
before scanning
Jul 12 11:26:58 pc196344 kernel:   Vendor: IBM       Model: Memory Key
Rev: 1.01
Jul 12 11:26:58 pc196344 kernel:   Type:   Direct-Access
ANSI SCSI revision: 00
Jul 12 11:26:58 pc196344 kernel: SCSI device sda: 64000 512-byte hdwr
sectors (33 MB)
Jul 12 11:26:58 pc196344 kernel: sda: Write Protect is off
Jul 12 11:26:58 pc196344 kernel: sda: Mode Sense: 43 00 00 00
Jul 12 11:26:58 pc196344 kernel: sda: assuming drive cache: write through
Jul 12 11:26:58 pc196344 kernel: SCSI device sda: 64000 512-byte hdwr
sectors (33 MB)
Jul 12 11:26:58 pc196344 kernel: sda: Write Protect is off
Jul 12 11:26:58 pc196344 kernel: sda: Mode Sense: 43 00 00 00
Jul 12 11:26:58 pc196344 kernel: sda: assuming drive cache: write through
Jul 12 11:26:58 pc196344 kernel:  /dev/scsi/host10/bus0/target0/lun0: p1
Jul 12 11:26:58 pc196344 kernel: Attached scsi removable disk sda at scsi10,
channel 0, id 0, lun 0
Jul 12 11:26:58 pc196344 kernel: Attached scsi generic sg2 at scsi10,
channel 0, id 0, lun 0,  type 0
Jul 12 11:26:58 pc196344 kernel: usb-storage: device scan complete
Jul 12 11:26:58 pc196344 scsi.agent[27309]: disk at
/devices/pci0000:00/0000:00:1d.2/usb4/4-2/4-2:1.0/host10/target10:0:0/10:0:0
:0

So, works very well.  Thanks very much for your help in solving this issue,
and hopefully we'll see this patch in 2.6.13 onwards.

James Roberts-Thomson
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