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

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Message-ID: <9f7a33a6-ac69-4fac-946a-ccb90060d243@arm.com>
Date: Mon, 4 Nov 2024 12:58:57 +0000
From: Lukasz Luba <lukasz.luba@....com>
To: Jinjie Ruan <ruanjinjie@...wei.com>, rafael@...nel.org,
 viresh.kumar@...aro.org, matthias.bgg@...il.com,
 angelogioacchino.delregno@...labora.com, hector.yuan@...iatek.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 11/4/24 11:36, 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>
> ---
> 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;
>   

LGTM,

Reviewed-by: Lukasz Luba <lukasz.luba@....com>