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SubjectRe: 2.6.24-rc5-mm1
On Wed, 19 Dec 2007, Dave Young wrote:

> I tested on another machine with kernel 2.6.24-rc2. And the result is
> diffrent again.
> Here is the result:
>
> 1. on 2.6.24-rc2, when I plugin the player the kernel reports below messages:
>
> usb-storage: waiting for device to settle before scanning
> /*[lets mark the below part as part 1]*/
> scsi 0:0:0:0: Direct-Access Newman mp3 PQ: 0 ANSI: 0 CCS
> sd 0:0:0:0: [sda] 245248 512-byte hardware sectors (126 MB)
> sd 0:0:0:0: [sda] Write Protect is on
> sd 0:0:0:0: [sda] Mode Sense: 03 00 80 00
> sd 0:0:0:0: [sda] Assuming drive cache: write through
> sd 0:0:0:0: [sda] 245248 512-byte hardware sectors (126 MB)
> sd 0:0:0:0: [sda] Write Protect is on
> sd 0:0:0:0: [sda] Mode Sense: 03 00 80 00
> sd 0:0:0:0: [sda] Assuming drive cache: write through
> sda: sda1
> /*[lets mark the below part as part 2]*/
> sd 0:0:0:0: [sda] Attached SCSI removable disk
> usb-storage: device scan complete
> sd 0:0:0:0: [sda] 245248 512-byte hardware sectors (126 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00
> sd 0:0:0:0: [sda] Assuming drive cache: write through
> sd 0:0:0:0: [sda] 245248 512-byte hardware sectors (126 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00
> sd 0:0:0:0: [sda] Assuming drive cache: write through
> sda: sda1

This is not normal. When you plug in a storage device you should get
all of the messages in your part 1 plus the first two lines in your
part 2, but not the rest of part 2.

> 2. on 2.6.24-rc5 kernel reports only the part 1, after try mount the
> disk it reports the part 2 and mount the partition as rw
>
> 3. on 2.6.24-rc5 kernel reports only the part 1, after try mount the
> disk it just mount the partition as ro with nothing more messages.

You must have a typo there. Those can't both be true for 2.6.24-rc5.
In fact you shouldn't see part 2 at all.

Here's what I get when I plug in a USB mass-storage device under
2.6.24-rc5:

[ 87.903014] usb-storage: device found at 2
[ 87.909570] scsi 0:0:0:0: Direct-Access Memorex TD 2B 1.09 PQ: 0 ANSI: 0 CCS
[ 87.913144] usb-storage: device scan complete
[ 88.804031] sd 0:0:0:0: [sda] 243712 512-byte hardware sectors (125 MB)
[ 88.805507] sd 0:0:0:0: [sda] Write Protect is off
[ 88.805577] sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00
[ 88.805639] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 88.809526] sd 0:0:0:0: [sda] 243712 512-byte hardware sectors (125 MB)
[ 88.810421] sd 0:0:0:0: [sda] Write Protect is off
[ 88.810488] sd 0:0:0:0: [sda] Mode Sense: 03 00 00 00
[ 88.810575] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 88.810641] sda: sda1
[ 88.812450] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 89.041014] sd 0:0:0:0: Attached scsi generic sg0 type 0

Mounting the disk produces no extra output at all. I get the same
result under 2.6.23 and earlier operating systems. You should see
approximately the same thing.

Alan Stern



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