linux-kernel - Re: 2.6.24-rc1: OOPS at acpi_battery

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Message-ID: <20071108164606.GB12231@cataract>
Date:	Thu, 8 Nov 2007 17:46:06 +0100
From:	Johannes Weiner <hannes@...urebad.de>
To:	Alexey Starikovskiy <astarikovskiy@...e.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Johannes Weiner <hannes-kernel@...urebad.de>,
	"Michael (rabenkind) Brandstetter" <listen@...fservix.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: 2.6.24-rc1: OOPS at  acpi_battery_update

Hi,

On Thu, Nov 08, 2007 at 07:11:53PM +0300, Alexey Starikovskiy wrote:
> Rafael J. Wysocki wrote:
> >On Thursday, 8 of November 2007, Johannes Weiner wrote:
> >>Hi,
> >>
> >>is there any reason, why acpi_battery_get_property() should call
> >>acpi_battery_update() at all?
> >
> >Alex?
> If someone wants to read stale values, he could comment out 
> acpi_battery_update.

Please help me to understand:

When the battery is plugged in, the acpi_battery_notify() is called,
which in turn calls acpi_battery_update(). The latter ensures that the
sysfs files are created if not yet present.

When the battery is removed, acpi_battery_notify is called, which in
turn calls acpi_battery_update(). The latter ensures that the sysfs
files are removed if present.

During runtime - as far as I understood - no sysfs files have to be
created/removed but the saved battery state info becomes stale.

So, would it be enough to call acpi_battery_get_state() in
acpi_battery_get_property() instead of acpi_battery_update()?

If acpi_battery_get_state() does what I think it does, this would
ensure that the battery state is reread and updated when
acpi_battery_get_property() is called.

Hit me.

	Hannes
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