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.