linux-kernel - Re: 2.6.24-rc5-mm1

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Date:	Thu, 20 Dec 2007 08:43:28 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Alan Stern" <stern@...land.harvard.edu>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, mdharm-usb@...-eyed-alien.net,
	gregkh@...e.de, linux-usb@...r.kernel.org,
	usb-storage@...ts.one-eyed-alien.net
Subject: Re: 2.6.24-rc5-mm1

On Dec 20, 2007 12:07 AM, Alan Stern <stern@...land.harvard.edu> wrote:
>
> 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.

Hi, Alan

I'm sure about my post. I'm not so famillar with usb.
It looks weird.  Seems that my device will be firstly recoganized as a
mp3 player and then a usb storage, so the system will report part 1 &
part 2 under previous  kernels.

Regards
dave
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