linux-kernel - Re: [RFC][PATCH v2] ACPI: Ignore invalid

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Date:	Fri, 4 May 2012 12:11:54 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Marco Aurelio da Costa <costa@...ic.com>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC][PATCH v2] ACPI: Ignore invalid _PSS entries, but use valid
 ones

On Fri, May 04, 2012 at 05:25:13PM +0200, Marco Aurelio da Costa wrote:
> From: Marco Aurelio da Costa <costa@...ic.com>
> [v2: Fixes suggested by Konrad]
> Signed-off-by: Marco Aurelio da Costa <costa@...ic.com>

Heh. You didn't compile test this version did you?
> 
> The EliteBook 8560W has non-initialized entries in its _PSS ACPI
> table. Instead of bailing out when the first non-initialized entry is
> found, ignore it and use only  the valid entries. Only bail out if there
> is no valid entry at all.
> 
> ---
> --- linux-3.3.3/drivers/acpi/processor_perflib.c.orig	2012-04-24
> 22:18:23.288041268 +0200
> +++ linux-3.3.3/drivers/acpi/processor_perflib.c	2012-05-04
> 17:22:57.400034613 +0200
> @@ -311,6 +311,7 @@ static int acpi_processor_get_performanc
>  	struct acpi_buffer state = { 0, NULL };
>  	union acpi_object *pss = NULL;
>  	int i;
> +	int last_invalid = -1;
> 
> 
>  	status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
> @@ -372,14 +373,32 @@ static int acpi_processor_get_performanc
>  		    ((u32)(px->core_frequency * 1000) !=
>  		     (px->core_frequency * 1000))) {
>  			printk(KERN_ERR FW_BUG PREFIX
> -			       "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
> -			       px->core_frequency);
> -			result = -EFAULT;
> -			kfree(pr->performance->states);
> -			goto end;
> +			       "Invalid BIOS _PSS frequency found for processor %d: 0x%llx MHz\n",
> +			       pr->id, px->core_frequency);
> +			if (last_invalidi == -1)

Hrmm. invalidi?

> +				last_invalid = i;
> +		} else {
> +			if (last_invalid != -1) {
> +				/*
> +				 * Copy this valid entry over last_invalid entry
> +				 */
> +				memcpy(&(pr->performance->states[last_invalid]),
> +				       px, sizeof(struct acpi_processor_px));
> +				++last_invalid;
> +			}
>  		}
>  	}
> 
> +	if (last_invalid == 0) {
> +		printk(KERN_ERR FW_BUG PREFIX
> +		       "No valid BIOS _PSS frequency found for processor %d\n", pr->id);
> +		result = -EFAULT;
> +		kfree(pr->performance->states);

Just as a precaution - also do this pls:

pr->performance->states = NULL?

> +	}
> +
> +	if (last_invalid > 0)
> +		pr->performance->state_count = last_invalid;
> +
>        end:
>  	kfree(buffer.pointer);
> 
> -- 
> Marco Costa
> Customer Support
> --
> GAMIC mbH
> Roermonder Strasse, 151
> 52072 Aachen
> Germany
> --
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