On Tuesday 07 April 2009, Vegard Nossum wrote:
> From 85a2a4447ce6b206d9ad20719ed8ac7cc707931c Mon Sep 17 00:00:00 2001
> From: Vegard Nossum <vegard.nossum@xxxxxxxxx>
> Date: Tue, 7 Apr 2009 10:55:38 +0200
> Subject: [PATCH] acpi/battery: fix async boot oops
>
> 2009/4/6 Arkadiusz Miskiewicz <a.miskiewicz@xxxxxxxxx>:
> >
> > Pulled Linus git few minutes ago and new oops at boot (happens on every boot).
> > Yesterday git version was fine. Oopsed just while/after udev started.
>
> [...]
>
> > BUG: unable to handle kernel NULL pointer dereference at (null)
> > IP: [<ffffffffa00fd040>] 0xffffffffa00fd040
> > PGD 13998a067 PUD 139979067 PMD 0
> > Oops: 0002 [#1] PREEMPT SMP
> > last sysfs file: /sys/devices/platform/i8042/modalias
> > CPU 0
> > Modules linked in: evdev(+) cfg80211(+) battery ac button crc_itu_t xfs exportfs scsi_wait_scan sd_mod crc_t10dif ahci libata scsi_mod
> > Pid: 3167, comm: async/0 Not tainted 2.6.29 #12 2764CTO
> > RIP: 0010:[<ffffffffa00fd040>] [<ffffffffa00fd040>] 0xffffffffa00fd040
>
> What happens is that the battery module's init sections are being freed
> before the async callback (which was marked __init) has run. This theory
> is supported by the fact that the bad RIP value is a vmalloc address.
>
> The immediate fix is to make this a non-init call.
>
> (A better long-term fix is of course to wait with init-section unloading
> until a module's async initcalls have been run, which would allow us to
> discard this function which is still only run once, after all. Perhaps a
> new async_initcall() function for the async/module API, if this is needed
> for other modules in the future?)
>
> Reported-by: Arkadiusz Miskiewicz <a.miskiewicz@xxxxxxxxx>
> Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
> Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxx>
This patch is necessary to fix a boot oops on my test box(es).
Tested-by: Rafael J. Wysocki <rjw@xxxxxxx>
> ---
> drivers/acpi/battery.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
> index b0de631..3c7d894 100644
> --- a/drivers/acpi/battery.c
> +++ b/drivers/acpi/battery.c
> @@ -903,7 +903,7 @@ static struct acpi_driver acpi_battery_driver = {
> },
> };
>
> -static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
> +static void acpi_battery_init_async(void *unused, async_cookie_t cookie)
> {
> if (acpi_disabled)
> return;
--
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