linux-kernel - Re: [Patch-next] Trival fixes in thermal_throttle_add

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Message-ID: <20100831085512.252ffa06@hyperion.delvare>
Date:	Tue, 31 Aug 2010 08:55:12 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Jin Dongming <jin.dongming@...css.fujitsu.com>
Cc:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...ux.jf.intel.com>,
	LKLM <linux-kernel@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>,
	mingo Redhat <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Patch-next] Trival fixes in thermal_throttle_add_dev().

Hi Jin

On Tue, 31 Aug 2010 09:55:48 +0900, Jin Dongming wrote:
> This patch fixed the following two problems.
>   1. When the feature PTS is not supported by CPU, the sysfile
>      package_power_limit_count for package should not be generated.
>   2. No matter whether a sysfile is failed to be created or not,
>      the next one will be created.
> 
> As the resolving methods:
>   1. Add missing { and } after checking PTS feature.
>   2. Fix the error handling.
> 
> Signed-off-by: Jin Dongming <jin.dongming@...css.fujitsu.com>
> Reviewed-by: Fenghua Yu <fenghua.yu@...tel.com>
> ---
>  arch/x86/kernel/cpu/mcheck/therm_throt.c |   15 ++++++++++++++-
>  1 files changed, 14 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
> index d9368ee..79d563a 100644
> --- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
> +++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
> @@ -216,14 +216,27 @@ static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev,
>  		err = sysfs_add_file_to_group(&sys_dev->kobj,
>  					      &attr_core_power_limit_count.attr,
>  					      thermal_attr_group.name);
> -	if (cpu_has(c, X86_FEATURE_PTS))
> +	if (err)
> +		goto error;
> +
> +	if (cpu_has(c, X86_FEATURE_PTS)) {
>  		err = sysfs_add_file_to_group(&sys_dev->kobj,
>  					      &attr_package_throttle_count.attr,
>  					      thermal_attr_group.name);
> +		if (err)
> +			goto error;
> +
>  		if (cpu_has(c, X86_FEATURE_PLN))
>  			err = sysfs_add_file_to_group(&sys_dev->kobj,
>  					&attr_package_power_limit_count.attr,
>  					thermal_attr_group.name);
> +		if (err)
> +			goto error;

Even though you are lucky that in the end it still works, this check is
misplaced. You should instead have:

		if (cpu_has(c, X86_FEATURE_PLN)) {
			err = sysfs_add_file_to_group(&sys_dev->kobj,
					&attr_package_power_limit_count.attr,
					thermal_attr_group.name);
			if (err)
				goto error;
		}


> +	}
> +
> +	return 0;
> +error:
> +	sysfs_remove_group(&sys_dev->kobj, &thermal_attr_group);
>  
>  	return err;
>  }


-- 
Jean Delvare
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