linux-kernel - Re: 2.6.24-rc5-mm1

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Message-ID: <a8e1da0712132132t6bcef833vc492e4164c22705a@mail.gmail.com>
Date:	Fri, 14 Dec 2007 13:32:40 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	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

Hi,
The behaviour of my mp3 player (also act as usb-storage device) seems
changed from rc5 to rc5-mm1.

<dmesg output under rc5>:
=========
usb 1-7: new high speed USB device using ehci_hcd and address 7
usb 1-7: configuration #1 chosen from 1 choice
scsi4 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 7
usb-storage: waiting for device to settle before scanning
scsi 4:0:0:0: Direct-Access                   Newman mp3       PQ: 0 ANSI: 0 CCS
sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB)
sd 4:0:0:0: [sdb] Write Protect is on
sd 4:0:0:0: [sdb] Mode Sense: 03 00 80 00
sd 4:0:0:0: [sdb] Assuming drive cache: write through
sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB)
sd 4:0:0:0: [sdb] Write Protect is on
sd 4:0:0:0: [sdb] Mode Sense: 03 00 80 00
sd 4:0:0:0: [sdb] Assuming drive cache: write through
 sdb: sdb1
sd 4:0:0:0: [sdb] Attached SCSI removable disk
sd 4:0:0:0: Attached scsi generic sg1 type 0
usb-storage: device scan complete

==========
try mount it (or just blockdev --rereadpt), then write protect become off:
==========

sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB)
sd 4:0:0:0: [sdb] Write Protect is off
sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00
sd 4:0:0:0: [sdb] Assuming drive cache: write through
sd 4:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB)
sd 4:0:0:0: [sdb] Write Protect is off
sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00
sd 4:0:0:0: [sdb] Assuming drive cache: write through
 sdb: sdb1

But under rc5-mm1, after mount command being executed, it is just
mouted as read only partition without set the write-protect to off

I tried "blockdev --rereadpt", it do set the write-protect to off as rc5 kernel.

Below is the output of dmesg under rc5-mm1
==========
usb 1-8: new high speed USB device using ehci_hcd and address 6
usb 1-8: configuration #1 chosen from 1 choice
scsi3 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning
scsi 3:0:0:0: Direct-Access                   Newman mp3       PQ: 0 ANSI: 0 CCS
sd 3:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB)
sd 3:0:0:0: [sdb] Write Protect is on
sd 3:0:0:0: [sdb] Mode Sense: 03 00 80 00
sd 3:0:0:0: [sdb] Assuming drive cache: write through
sd 3:0:0:0: [sdb] 245248 512-byte hardware sectors (126 MB)
sd 3:0:0:0: [sdb] Write Protect is on
sd 3:0:0:0: [sdb] Mode Sense: 03 00 80 00
sd 3:0:0:0: [sdb] Assuming drive cache: write through
 sdb: sdb1

Regards
dave
sd 3:0:0:0: [sdb] Attached SCSI removable disk
sd 3:0:0:0: Attached scsi generic sg1 type 0
usb-storage: device scan complete


Regards
dave
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