linux-kernel - Re: [PATCH] thermal: exynos: fix handling of invalid frequency table entries

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Date:	Wed, 10 Apr 2013 10:06:53 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Andrew Bresticker <abrestic@...omium.org>
Cc:	Eduardo Valentin <eduardo.valentin@...com>,
	Kukjin Kim <kgene.kim@...sung.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] thermal: exynos: fix handling of invalid frequency
 table entries

Hi, Andrew,

can you please verify
commit 	fc35b35cbe24ef021ea9acfba21e54da958df747
commit 57df8106932b57427df1eaaa13871857f75b1194
at
http://git.kernel.org/cgit/linux/kernel/git/rzhang/linux.git/log/?h=thermal
fixes the problem for you?

thanks,
rui 
    
On Tue, 2013-04-09 at 14:59 -0700, Andrew Bresticker wrote:
> Similar to the error described in "thermal: cpu_cooling: fix handling
> of invalid frequency table entries," exynos_get_frequency_level() will
> enter an infinite loop if any CPU frequency table entries are invalid.
> This patch fixes the handling of invalid frequency entries so that
> there is no infinite loop and the correct level is returned.
> 
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> ---
>  drivers/thermal/exynos_thermal.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c
> index d5e6267..524b2a0 100644
> --- a/drivers/thermal/exynos_thermal.c
> +++ b/drivers/thermal/exynos_thermal.c
> @@ -237,7 +237,7 @@ static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
>  
>  static int exynos_get_frequency_level(unsigned int cpu, unsigned int freq)
>  {
> -	int i = 0, ret = -EINVAL;
> +	int i, level = 0, ret = -EINVAL;
>  	struct cpufreq_frequency_table *table = NULL;
>  #ifdef CONFIG_CPU_FREQ
>  	table = cpufreq_frequency_get_table(cpu);
> @@ -245,12 +245,12 @@ static int exynos_get_frequency_level(unsigned int cpu, unsigned int freq)
>  	if (!table)
>  		return ret;
>  
> -	while (table[i].frequency != CPUFREQ_TABLE_END) {
> +	for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
>  		if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
>  			continue;
>  		if (table[i].frequency == freq)
> -			return i;
> -		i++;
> +			return level;
> +		level++;
>  	}
>  	return ret;
>  }


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