linux-kernel - Re: acer-wmi broken in latest git kernel on TravelMate 6492 (Insufficient arguments

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Date:	Sat, 2 Aug 2008 19:01:48 +0200 (CEST)
From:	Sven Wegener <sven.wegener@...aler.net>
To:	Carlos Corbacho <carlos@...angeworlds.co.uk>
cc:	Bob Moore <robert.moore@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Lin Ming <ming.m.lin@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: acer-wmi broken in latest git kernel on TravelMate 6492
 (Insufficient arguments - method [WQAA])

On Sat, 2 Aug 2008, Carlos Corbacho wrote:

> On Saturday 02 August 2008 16:50:54 Sven Wegener wrote:
> > Is it a bug in acer-wmi or in Acer's ACPI implementation? I can provide 
> > more information as necessary.
> 
> Neither - it's a bug in wmi.c
> 
> Try the following patch:
> ---
> ACPI: WMI: Set instance for query block calls
> 
> From: Carlos Corbacho <carlos@...angeworlds.co.uk>
> 
> Although the necessary data structure was set up, it was never actually
> passed in, so data block calls have only been working by sheer chance.
> 
> (On Acer laptops. the data block methods we've been calling never look at
> the instance value, hence acer-wmi never triggered this before).
> 
> f3454ae8104efb2dbf0d08ec42c6f5d0fe9225bc brought this to light.
> 
> Signed-off-by: Carlos Corbacho <carlos@...angeworlds.co.uk>

Yep, that fixes it, thanks.

Tested-by: Sven Wegener <sven.wegener@...aler.net>

> diff --git a/drivers/acpi/wmi.c b/drivers/acpi/wmi.c
> index c33b1c6..cfe2c83 100644
> --- a/drivers/acpi/wmi.c
> +++ b/drivers/acpi/wmi.c
> @@ -347,7 +347,7 @@ struct acpi_buffer *out)
>  	strcpy(method, "WQ");
>  	strncat(method, block->object_id, 2);
>  
> -	status = acpi_evaluate_object(handle, method, NULL, out);
> +	status = acpi_evaluate_object(handle, method, &input, out);
>  
>  	/*
>  	 * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
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