commit "ACPI: battery: asynchronous init" brokes my boot up process

[Alexey Klimov]

Hello,

I don't know if i do right thing creating this letter but looks like
this commit 0f66af530116e9f4dd97f328d91718b56a6fc5a4 "ACPI: battery:
asynchronous init" brokes my boot up process. My machine is pentium-m
cpu, Gentoo, gcc 4.3.3-r2.
When openRC started and i got something like "Processing udev
events(?)" (i can't see exactly words) i got this:

ACPI: Battery Slot [BAT1] (battery present)
BUG: unable to handle kernel paging request at f8530030
IP: [<f8530030>] 0xf8530030
*pde = 37288067 *pte = 00000000
Oops: 0000 [#1]
last sysfs file: /sys/devices/pnp0/00:07/id
Modules linked in: ehci_hcd(+) sg container(+) battery uhci_hcd
thermal button ac usbhid hid cpufreq_ondemand acpi_cpufreq
snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
snd_pcm_oss snd_mixer_oss snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm
snd_timer snd soundcore snd_page_alloc usbcore rtc_cmos rtc_core
rtc_lib

Pid: 913, comm: async/0 Not tainted (2.6.29 #34) TravelMate 2350
EIP: 0060:[<f8530030>] EFLAGS: 00010246 CPU: 0
EIP is at 0xf8530030
EAX: 00000000 EBX: 00000216 ECX: 00000001 EDX: 00000000
ESI: c0129c47 EDI: f64bb5a0 EBP: 00000000 ESP: f660dfb0
 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
Process async/0 (pid: 913, ti=f660d000 task=f6574d40 task.ti=f660d000)
Stack:
 c0129d1e f7035f88 00000296 00000000 f6574d40 c0115dd2 f7035fc8 c0369bc0
 00000000 00000000 c0125c76 c0125c40 00000000 c0102f23 f7035f7c 00000000
 00000000 00000000 00005067 003c8067
Call Trace:
 [<c0129d1e>] ? async_thread+0xd7/0x1a8
 [<c0115dd2>] ? default_wake_function+0x0/0x8
 [<c0125c76>] ? kthread+0x36/0x5a
 [<c0125c40>] ? kthread+0x0/0x5a
 [<c0102f23>] ? kernel_thread_helper+0x7/0x10
Code:  Bad EIP value.
EIP: [<f8530030>] 0xf8530030 SS:ESP 0068:f660dfb0
CR2: 00000000f8530030
---[ end trace d9fadf449e253313 ]---
ehci_hcd 0000:00:1d.7: irq 23, io mem 0xf0080000
ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00
usb usb4: New USB device found, idVendor=1d6b, idProduct=0002
usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1

And boot up process freezes when system tries to restart udev later.
I didn't  have this issue in 2.6.29-git12. It presented in
2.6.29-git15 and 2.6.30-rc1.
Firstly i thought that there is conflict(or race) with usb modules,
and i tried to unplug all my usb devices before reboot, but issue
still present in 2.6.30-rc1.

Well, then i removed many apci modules like button, fan, battery,
thermal and finally figured out that battery module is buggy on my
system.
I cancel changes provided by this commit in drivers/acpi/battery.c
file and re-compiled modules. Boot up started to works fine.

Probably this happens due to: 1) cos my notebook too old and battery
isn't works long, 2) Gentoo' boot up process is bad.
May be kernel option in menuconfig can be appropriate?

-- 
Best regards, Klimov Alexey
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