linux-kernel - Re: [PATCH v2] cpufreq: mediatek: Fix resource leaks on mtk_cpu_create_freq

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Message-ID: <20241001053906.mkhld5ufrmpdhfud@vireshk-i7>
Date: Tue, 1 Oct 2024 11:09:06 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Riyan Dhiman <riyandhiman14@...il.com>
Cc: rafael@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cpufreq: mediatek: Fix resource leaks on
 mtk_cpu_create_freq_table() failure

On 07-09-24, 22:06, Riyan Dhiman wrote:
> If mtk_cpu_create_freq_table() fails then there is a potential resource leak because 
> memory region is not released and IO memory is not unmapped. 
> Added error handling to ensure proper cleanup of all resources on failure, preventing potential leaks.
> 
> Fixes: d776790a5536 (cpufreq: mediatek-hw: Fix double devm_remap in hotplug case)
> 
> Signed-off-by: Riyan Dhiman <riyandhiman14@...il.com>
> ---
> It is more of a extension of the above commit as this error handling was missing in that commit.
> 
> v2: Fix commit message.
> v1: Added error handling.
> 
>  drivers/cpufreq/mediatek-cpufreq-hw.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
> index 8925e096d5b9..3b1303f350ec 100644
> --- a/drivers/cpufreq/mediatek-cpufreq-hw.c
> +++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
> @@ -207,13 +207,15 @@ static int mtk_cpu_resources_init(struct platform_device *pdev,
>  	ret = mtk_cpu_create_freq_table(pdev, data);
>  	if (ret) {
>  		dev_info(dev, "Domain-%d failed to create freq table\n", index);
> -		return ret;
> +		goto unmap_region;
>  	}
>  
>  	policy->freq_table = data->table;
>  	policy->driver_data = data;
>  
>  	return 0;
> +unmap_region:
> +	iounmap(base);

Since this driver already uses devm_* APIs, what about using them
instead ?

-- 
viresh