linux-kernel - Re: [PATCH v2] PM: EM: Fix wrong return value in mtk_cpufreq_get_cpu

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Message-ID: <786c90d1-29e7-72a7-acc6-394b3bbaeb75@huawei.com>
Date: Thu, 7 Nov 2024 09:50:26 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <rafael@...nel.org>, <viresh.kumar@...aro.org>, <matthias.bgg@...il.com>,
	<angelogioacchino.delregno@...labora.com>, <hector.yuan@...iatek.com>,
	<lukasz.luba@....com>, <qperret@...gle.com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2] PM: EM: Fix wrong return value in
 mtk_cpufreq_get_cpu_power()



On 2024/11/4 19:36, Jinjie Ruan wrote:
> mtk_cpufreq_get_cpu_power() return 0 if the policy is NULL. Then in
> em_create_perf_table(), the later zero check for power is not invalid
> as power is uninitialized. As Lukasz suggested, it must return -EINVAL when
> the 'policy' is not found. So return -EINVAL to fix it.
> 
> Cc: stable@...r.kernel.org
> Fixes: 4855e26bcf4d ("cpufreq: mediatek-hw: Add support for CPUFREQ HW")
> Suggested-by: Lukasz Luba <lukasz.luba@....com>
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>

Hi, could this be merged.

> ---
> v2:
> - Fix the driver instead of em_create_perf_table() as suggested.
> - Update the commit message.
> - Add Suggested-by.
> ---
>  drivers/cpufreq/mediatek-cpufreq-hw.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
> index 8925e096d5b9..aeb5e6304542 100644
> --- a/drivers/cpufreq/mediatek-cpufreq-hw.c
> +++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
> @@ -62,7 +62,7 @@ mtk_cpufreq_get_cpu_power(struct device *cpu_dev, unsigned long *uW,
>  
>  	policy = cpufreq_cpu_get_raw(cpu_dev->id);
>  	if (!policy)
> -		return 0;
> +		return -EINVAL;
>  
>  	data = policy->driver_data;
>