linux-kernel - Re: [PATCH 2/3] cpumask: fix powernow-k8: partial revert of 2fdf66b491ac706657946442789ec644cc317e1a

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Date:	Mon, 9 Feb 2009 11:17:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Mike Travis <travis@....com>, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 2/3] cpumask: fix powernow-k8: partial revert of
	2fdf66b491ac706657946442789ec644cc317e1a


* Rusty Russell <rusty@...tcorp.com.au> wrote:

> Impact: fix powernow-k8 when acpi=off (or other error).
> 
> There was a spurious change introduced into powernow-k8 in this patch:
> the cause if that we try to "restore" the cpus_allowed we never saved.
> 
> See lkml "[PATCH] x86/powernow: fix cpus_allowed brokage when
> acpi=off" from Yinghai for the bug report.
> 
> Cc: Mike Travis <travis@....com>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> ---
>  arch/x86/kernel/cpu/cpufreq/powernow-k8.c |   12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
> --- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
> +++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
> @@ -1142,8 +1142,7 @@ static int __cpuinit powernowk8_cpu_init
>  	data->cpu = pol->cpu;
>  	data->currpstate = HW_PSTATE_INVALID;
>  
> -	rc = powernow_k8_cpu_init_acpi(data);
> -	if (rc) {
> +	if (powernow_k8_cpu_init_acpi(data)) {
>  		/*
>  		 * Use the PSB BIOS structure. This is only availabe on
>  		 * an UP version, and is deprecated by AMD.
> @@ -1161,17 +1160,20 @@ static int __cpuinit powernowk8_cpu_init
>  			       "ACPI maintainers and complain to your BIOS "
>  			       "vendor.\n");
>  #endif
> -			goto err_out;
> +			kfree(data);
> +			return -ENODEV;
>  		}
>  		if (pol->cpu != 0) {
>  			printk(KERN_ERR FW_BUG PFX "No ACPI _PSS objects for "
>  			       "CPU other than CPU0. Complain to your BIOS "
>  			       "vendor.\n");
> -			goto err_out;
> +			kfree(data);
> +			return -ENODEV;
>  		}
>  		rc = find_psb_table(data);
>  		if (rc) {
> -			goto err_out;
> +			kfree(data);
> +			return -ENODEV;
>  		}

hm, why the 3-way duplication of this pattern:

> +			kfree(data);
> +			return -ENODEV;

because it's a straight revert?

	Ingo
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