On Thu, 2008-10-23 at 22:42 +0200, Rafael J. Wysocki wrote:
> On Thursday, 23 of October 2008, James Bottomley wrote:
> > ACPI Warning (nseval-0168): Insufficient arguments - method [_OSC] needs 5, found 4 [20080926]
> > ACPI Warning (nspredef-0252): \_SB_.PCI0._OSC: Parameter count mismatch - ASL declared 5, expected 4 [20080926]
> > ACPI Error (nspredef-0163): \_SB_.PCI0._OSC: Missing expected return value [20080926]
> > BUG: unable to handle kernel NULL pointer dereference at 00000000
> Does this patch help?
>
> ---
> drivers/pci/pci-acpi.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> Index: linux-2.6/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pci-acpi.c
> +++ linux-2.6/drivers/pci/pci-acpi.c
> @@ -83,6 +83,9 @@ static acpi_status acpi_run_osc(acpi_han
> if (ACPI_FAILURE(status))
> return status;
>
> + if (!output.pointer)
> + return AE_NULL_OBJECT;
> +
> out_obj = output.pointer;
> if (out_obj->type != ACPI_TYPE_BUFFER) {
> printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
Yes, that seems to fix it, thanks! ... I suppose the ASL error and
warnings need investigating too?
James
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