2.6.6 Oops disconnecting speedtouch usb modem

[Nuno Ferreira <nuno.ferreira@graycell.biz>]

After upgrading from 2.6.5 to 2.6.6 I got this error while disconnecting
my Speedtouch USB ADSL modem.

May 10 23:31:57 taz kernel: usb 1-1: USB disconnect, address 2
May 10 23:31:57 taz kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000004
May 10 23:31:57 taz kernel:  printing eip:
May 10 23:31:57 taz kernel: c02315d4
May 10 23:31:57 taz kernel: *pde = 00000000
May 10 23:31:57 taz kernel: Oops: 0000 [#1]
May 10 23:31:57 taz kernel: CPU:    0
May 10 23:31:57 taz kernel: EIP:    0060:[destroy_async+84/128]    Not tainted
May 10 23:31:57 taz kernel: EFLAGS: 00010013   (2.6.6)
May 10 23:31:57 taz kernel: EIP is at destroy_async+0x54/0x80
May 10 23:31:57 taz kernel: eax: dcd656ac   ebx: 00000286   ecx: 00000000   edx: dcd65690
May 10 23:31:57 taz kernel: esi: dcd656ac   edi: dcd65690   ebp: dd39e424   esp: ddd75ea0
May 10 23:31:57 taz kernel: ds: 007b   es: 007b   ss: 0068
May 10 23:31:57 taz kernel: Process khubd (pid: 5, threadinfo=ddd75000 task=ddfa6030)
May 10 23:31:57 taz kernel: Stack: c022e368 ddd13294 c0330ba0 dd39e400 c02316c9 dcd65690 dcd656ac c022873a
May 10 23:31:57 taz kernel:        ddd13294 ddd13294 dd15f648 ddd132a4 c0330bc0 c01f6a94 ddd132a4 ddd132cc
May 10 23:31:57 taz kernel:        ddd132a4 dd39e4cc c01f6bc5 ddd132a4 ddd132fc ddd132a4 dd39e4cc c01f5b2d
May 10 23:31:57 taz kernel: Call Trace:
May 10 23:31:57 taz kernel:  [usb_disable_interface+56/80] usb_disable_interface+0x38/0x50
May 10 23:31:57 taz kernel:  [driver_disconnect+57/64] driver_disconnect+0x39/0x40
May 10 23:31:57 taz kernel:  [usb_unbind_interface+122/128] usb_unbind_interface+0x7a/0x80
May 10 23:31:57 taz kernel:  [device_release_driver+100/112] device_release_driver+0x64/0x70
May 10 23:31:57 taz kernel:  [bus_remove_device+85/160] bus_remove_device+0x55/0xa0
May 10 23:31:57 taz kernel:  [device_del+93/160] device_del+0x5d/0xa0
May 10 23:31:57 taz kernel:  [device_unregister+19/48] device_unregister+0x13/0x30
May 10 23:31:57 taz kernel:  [usb_disable_device+111/176] usb_disable_device+0x6f/0xb0
May 10 23:31:57 taz kernel:  [usb_disconnect+150/240] usb_disconnect+0x96/0xf0
May 10 23:31:57 taz kernel:  [hub_port_connect_change+625/640] hub_port_connect_change+0x271/0x280
May 10 23:31:57 taz kernel:  [hub_port_status+67/176] hub_port_status+0x43/0xb0
May 10 23:31:57 taz kernel:  [hub_events+672/768] hub_events+0x2a0/0x300
May 10 23:31:57 taz kernel:  [hub_thread+45/240] hub_thread+0x2d/0xf0
May 10 23:31:57 taz kernel:  [default_wake_function+0/32] default_wake_function+0x0/0x20
May 10 23:31:57 taz kernel:  [hub_thread+0/240] hub_thread+0x0/0xf0
May 10 23:31:57 taz kernel:  [kernel_thread_helper+5/20] kernel_thread_helper+0x5/0x14
May 10 23:31:57 taz kernel:
May 10 23:31:57 taz kernel: Code: 8b 51 04 8b 01 89 50 04 89 02 89 49 04 89 09 53 9d 8b 41 20

I also had another problem before that one, modem_run complained that it
couldn't read interrupts and exited. The connections stayed up, though.

May 10 23:22:31 taz modem_run[1364]: [monitoring report] ADSL link went
up
May 10 23:22:50 taz modem_run[874]: ADSL synchronization has been obtained
May 10 23:22:50 taz modem_run[874]: ADSL line is up (512 kbit/s down | 128 kbit/s up)
May 10 23:22:50 taz modem_run[1364]: Error reading interrupts
May 10 23:22:50 taz modem_run[1364]: [monitoring report] ADSL link went down
May 10 23:22:51 taz modem_run[1364]: Device disconnected, shutting down

Neither of these problems happen with the same setup running 2.6.5. I'll
try to find more find more information about this second problem when I
get home.

Anyone else having problems with the speedtouch usb on 2.6.6?
-- 
Nuno Ferreira