linux-kernel - Re: [PATCH] cpufreq: mediatek: Use dev_err

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Date: Tue, 2 Jul 2024 07:47:55 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 Matthias Brugger <matthias.bgg@...il.com>
Cc: kernel@...labora.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] cpufreq: mediatek: Use dev_err_probe in every error path
 in probe

Il 28/06/24 21:48, Nícolas F. R. A. Prado ha scritto:
> Use the dev_err_probe() helper to log the errors on every error path in
> the probe function and its sub-functions. This includes
> * adding error messages where there was none
> * converting over dev_err/dev_warn
> * removing the top-level error message after mtk_cpu_dvfs_info_init() is
>    called, since every error path inside that function already logs the
>    error reason. This gets rid of the misleading error message when probe
>    is deferred:
> 
>      mtk-cpufreq mtk-cpufreq: failed to initialize dvfs info for cpu0
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
>   drivers/cpufreq/mediatek-cpufreq.c | 66 ++++++++++++++++++--------------------
>   1 file changed, 31 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> index 518606adf14e..b21425bb83be 100644
> --- a/drivers/cpufreq/mediatek-cpufreq.c
> +++ b/drivers/cpufreq/mediatek-cpufreq.c

..snip..

> @@ -487,7 +488,7 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
>   	rate = clk_get_rate(info->inter_clk);
>   	opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
>   	if (IS_ERR(opp)) {
> -		dev_err(cpu_dev, "cpu%d: failed to get intermediate opp\n", cpu);
> +		dev_err_probe(cpu_dev, ret, "cpu%d: failed to get intermediate opp\n", cpu);
>   		ret = PTR_ERR(opp);

I believe you want to first assign ret, and then use it in dev_err_probe() :-P

Please fix. After which:

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Cheers!

>   		goto out_disable_inter_clock;
>   	}
> @@ -501,7 +502,7 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
>   	info->opp_nb.notifier_call = mtk_cpufreq_opp_notifier;
>   	ret = dev_pm_opp_register_notifier(cpu_dev, &info->opp_nb);
>   	if (ret) {
> -		dev_err(cpu_dev, "cpu%d: failed to register opp notifier\n", cpu);
> +		dev_err_probe(cpu_dev, ret, "cpu%d: failed to register opp notifier\n", cpu);
>   		goto out_disable_inter_clock;
>   	}
>   
> @@ -629,11 +630,9 @@ static int mtk_cpufreq_probe(struct platform_device *pdev)
>   	int cpu, ret;
>   
>   	data = dev_get_platdata(&pdev->dev);
> -	if (!data) {
> -		dev_err(&pdev->dev,
> -			"failed to get mtk cpufreq platform data\n");
> -		return -ENODEV;
> -	}
> +	if (!data)
> +		return dev_err_probe(&pdev->dev, -ENODEV,
> +				     "failed to get mtk cpufreq platform data\n");
>   
>   	for_each_possible_cpu(cpu) {
>   		info = mtk_cpu_dvfs_info_lookup(cpu);
> @@ -643,24 +642,21 @@ static int mtk_cpufreq_probe(struct platform_device *pdev)
>   		info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
>   		if (!info) {
>   			ret = -ENOMEM;
> +			dev_err_probe(&pdev->dev, ret, "Failed to allocate dvfs_info\n");
>   			goto release_dvfs_info_list;
>   		}
>   
>   		info->soc_data = data;
>   		ret = mtk_cpu_dvfs_info_init(info, cpu);
> -		if (ret) {
> -			dev_err(&pdev->dev,
> -				"failed to initialize dvfs info for cpu%d\n",
> -				cpu);
> +		if (ret)
>   			goto release_dvfs_info_list;
> -		}
>   
>   		list_add(&info->list_head, &dvfs_info_list);
>   	}
>   
>   	ret = cpufreq_register_driver(&mtk_cpufreq_driver);
>   	if (ret) {
> -		dev_err(&pdev->dev, "failed to register mtk cpufreq driver\n");
> +		dev_err_probe(&pdev->dev, ret, "failed to register mtk cpufreq driver\n");
>   		goto release_dvfs_info_list;
>   	}
>   
> 
> ---
> base-commit: 0fc4bfab2cd45f9acb86c4f04b5191e114e901ed
> change-id: 20240627-mtk-cpufreq-dvfs-fail-init-err-0a662ca72de2
> 
> Best regards,