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Message-ID: <alpine.DEB.1.00.0909151642100.24059@chino.kir.corp.google.com>
Date: Tue, 15 Sep 2009 16:45:37 -0700 (PDT)
From: David Rientjes <rientjes@...gle.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
cc: Kurt Roeckx <kurt@...ckx.be>, Dave Jones <davej@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Kernel Testers <kernel-testers@...r.kernel.org>,
Mark Langsdorf <mark.langsdorf@....com>,
Naga Chumbalkar <nagananda.chumbalkar@...com>
Subject: Re: [Bug #13780] NULL pointer dereference loading powernowk8
On Thu, 10 Sep 2009, Rafael J. Wysocki wrote:
> > So I did a biset, and this is the result:
> > $ git bisect good
> > 0e64a0c982c06a6b8f5e2a7f29eb108fdf257b2f is first bad commit
> > commit 0e64a0c982c06a6b8f5e2a7f29eb108fdf257b2f
> > Author: Dave Jones <davej@...hat.com>
> > Date: Wed Feb 4 14:37:50 2009 -0500
> >
> > [CPUFREQ] checkpatch cleanups for powernow-k8
> >
> > This driver has so many long function names, and deep nested if's
> > The remaining warnings will need some code restructuring to clean up.
> >
> > Signed-off-by: Dave Jones <davej@...hat.com>
> >
> > :040000 040000 45d8e325663e62e0833cf4e1cb8b27fa4a9b3a56 affb6fab44cb22aca8a33ca0d767797831fc2bae M arch
> >
> > 2.6.29-rc5 is good, -rc7 is bad.
>
> Thanks for the update and for doing the bisection.
>
0e64a0c has this cleanup, which isn't equivalent to the previous code:
@@ -779,11 +834,12 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
goto err_out;
}
- if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
- (data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
+ space_id = data->acpi_data.control_register.space_id;
+ if ((space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
+ (space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
dprintk("Invalid control/status registers (%x - %x)\n",
data->acpi_data.control_register.space_id,
- data->acpi_data.status_register.space_id);
+ space_id);
goto err_out;
}
This got fixed in 2c701b1 in 2.6.31-rc8, so this is most likely the
problem that Kurt was encountering.
Kurt, could you try 2.6.31 and see if you still experience the issue? If
not, this can be closed.
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