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Subject[Bug 479] New: visor module oops

Summary: visor module oops
Kernel Version: 2.5.65
Status: NEW
Severity: normal

Distribution: Mandrake Cooker
Hardware Environment: Hitachi laptop, Intel USB controller/PIIX4 chipset
Software Environment: pilot-link/kpilot,nodevfs, nohotplug running
Problem Description: oops when unloading visor module

Steps to reproduce:
Plug in your palm (I use a clie T615C). Press the hotsync button.
Then modprobe visor module. Press cancel on the palm.
rmmod visor and it rmmod segfault.
On the other hand, if I modprobe visor first, then press the button,
then run kpilot, then it works perfectly.

dmesg gives:
Unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip:
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0060:[<c01f577b>] Not tainted
EFLAGS: 00010246
EIP is at devclass_remove_driver+0x4b/0x90
eax: d0915c04 ebx: c03605c4 ecx: 00000000 edx: 00000000
esi: c0360580 edi: d0915bbc ebp: c42d7f14 esp: c42d7f00
ds: 007b es: 007b ss: 0068
Process rmmod (pid: 20800, threadinfo=c42d6000 task=c74bd2e0)
Stack: c030c1ff 00000042 d090fa80 d090fa40 d0915bbc c42d7f30 c01f4fbf d0915bbc
00000042 d0915bc8 d0915bbc d0915d60 c42d7f48 c01f53fa d0915bbc
c0358ab8 00000880 c42d7f54 d09137ce d0915bbc c42d7fbc c012df1e
Call Trace:
[<d090fa80>] usb_serial_bus_type+0x40/0xe0 [usbserial]
[<d090fa40>] usb_serial_bus_type+0x0/0xe0 [usbserial]
[<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
[<c01f4fbf>] bus_remove_driver+0x5f/0xa0
[<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
[<d0915bc8>] handspring_device+0x28/0xe0 [visor]
[<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
[<d0915d60>] +0x0/0x100 [visor]
[<c01f53fa>] driver_unregister+0x1a/0x44
[<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
[<d09137ce>] +0x1e/0x30 [visor]
[<d0915bbc>] handspring_device+0x1c/0xe0 [visor]
[<c012df1e>] sys_delete_module+0x1de/0x240
[<c0142317>] sys_munmap+0x57/0x80
[<c010948b>] syscall_call+0x7/0xb

Code: 89 4a 04 89 11 89 40 04 89 47 48 89 3c 24 e8 42 fe ff ff 89

I use a vanilla 2.5.65, modules-init-tools 0.9.9.

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