linux-kernel - [BUG] usb-storage hangs while waiting for device to settle

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Date:	Fri, 12 Jun 2009 15:35:42 +0300
From:	Ozan Çağlayan <ozan@...dus.org.tr>
To:	linux-kernel <linux-kernel@...r.kernel.org>, arjan@...ux.intel.com,
	Alan Stern <stern@...land.harvard.edu>
Subject: [BUG] usb-storage hangs while waiting for device to settle

Hi,

One of our users reported that he had some issues with its Sony Walkman
after switching from 2.6.30_rc7(-git2) to 2.6.30_rc8(-git6).

2.6.30_rc7
-----------------

kernel: [  108.441141] usb 2-6: new high speed USB device using ehci_hcd and
address 4
kernel: [  108.556121] usb 2-6: New USB device found, idVendor=054c,
idProduct=036e
kernel: [  108.556129] usb 2-6: New USB device strings: Mfr=1, Product=2,
SerialNumber=5
kernel: [  108.556138] usb 2-6: Product: WALKMAN
kernel: [  108.556143] usb 2-6: Manufacturer: SONY
kernel: [  108.556149] usb 2-6: SerialNumber: 390100011A5487120002D8F517EBC712
kernel: [  108.556319] usb 2-6: configuration #1 chosen from 1 choice
kernel: [  108.683661] Initializing USB Mass Storage driver...
kernel: [  108.697813] scsi6 : SCSI emulation for USB Mass Storage devices
kernel: [  108.698127] usbcore: registered new interface driver usb-storage
kernel: [  108.698130] USB Mass Storage support registered.
kernel: [  108.699047] usb-storage: device found at 4
kernel: [  108.699049] usb-storage: waiting for device to settle before
scanning
kernel: [  109.699338] usb-storage: device scan complete
kernel: [  109.699951] scsi 6:0:0:0: Direct-Access     SONY     WALKMAN        
 1.00 PQ: 0 ANSI: 4
kernel: [  109.701500] sd 6:0:0:0: Attached scsi generic sg2 type 0
kernel: [  109.704761] sd 6:0:0:0: [sdb] 956544 2048-byte hardware sectors:
(1.95 GB/1.82 GiB)
kernel: [  109.705274] sd 6:0:0:0: [sdb] Write Protect is off
kernel: [  109.705281] sd 6:0:0:0: [sdb] Mode Sense: 3e 00 00 00
kernel: [  109.705287] sd 6:0:0:0: [sdb] Assuming drive cache: write through
kernel: [  109.706885] sd 6:0:0:0: [sdb] 956544 2048-byte hardware sectors:
(1.95 GB/1.82 GiB)
kernel: [  109.738043] sd 6:0:0:0: [sdb] Assuming drive cache: write through
kernel: [  109.738047]  sdb: sdb1
kernel: [  109.751755] sd 6:0:0:0: [sdb] Attached SCSI removable disk
kernel: [  115.288030] FAT: utf8 is not a recommended IO charset for FAT
filesystems, filesystem will be case sensitive!
hald: mounted /dev/sdb1 on behalf of uid 1000

2.6.30_rc8
-----------

kernel: [210.259083] usb 2-6: new high speed USB device using ehci_hcd and
address 5
kernel: [210.374010] usb 2-6: New USB device found, idVendor=054c,
idProduct=036e
kernel: [210.374019] usb 2-6: New USB device strings: Mfr=1, Product=2,
SerialNumber=5
kernel: [210.374028] usb 2-6: Product: WALKMAN
kernel: [210.374033] usb 2-6: Manufacturer: SONY
kernel: [210.374038] usb 2-6: SerialNumber: 390100011A5487120002D8F517EBC712
kernel: [210.374216] usb 2-6: configuration #1 chosen from 1 choice
kernel: [210.381558] scsi7 : SCSI emulation for USB Mass Storage devices
kernel: [210.381893] usb-storage: device found at 5
kernel: [210.381899] usb-storage: waiting for device to settle before scanning


I looked a little bit the differences between rc7 and rc8 and the only commit that could be related to that problem seems to be:

d5a877e8dd409d8c702986d06485c374b705d340 async: make sure independent async domains can't accidentally entangle

I'm also attaching the kernel configuration. I'll make him to try again with the stable 2.6.30.

Thanks.






View attachment "config" of type "text/plain" (96102 bytes)