linux-kernel - Re: [thermal-next PATCH 2/2] thermal: qcom: tsens: simplify debugfs init function

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Message-ID: <8e679407-07e7-244a-48fa-0d4d451d744d@linaro.org>
Date:   Wed, 28 Apr 2021 12:47:30 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [thermal-next PATCH 2/2] thermal: qcom: tsens: simplify debugfs
 init function

Hi,

Please include a cover letter next time describing the patch series.

On 4/18/21 9:29 PM, Ansuel Smith wrote:
> Simplify debugfs init function.
> - Drop useless variables
> - Add check for existing dev directory.
> - Fix wrong version in dbg_version_show (with version 0.0.0, 0.1.0 was
>    incorrectly reported)
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>   drivers/thermal/qcom/tsens.c | 16 +++++++---------
>   1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
> index f9d50a67e..b086d1496 100644
> --- a/drivers/thermal/qcom/tsens.c
> +++ b/drivers/thermal/qcom/tsens.c
> @@ -692,7 +692,7 @@ static int dbg_version_show(struct seq_file *s, void *data)
>   			return ret;
>   		seq_printf(s, "%d.%d.%d\n", maj_ver, min_ver, step_ver);
>   	} else {
> -		seq_puts(s, "0.1.0\n");
> +		seq_printf(s, "0.%d.0\n", priv->feat->ver_major);
>   	}
>   
>   	return 0;
> @@ -704,21 +704,19 @@ DEFINE_SHOW_ATTRIBUTE(dbg_sensors);
>   static void tsens_debug_init(struct platform_device *pdev)
>   {
>   	struct tsens_priv *priv = platform_get_drvdata(pdev);
> -	struct dentry *root, *file;
>   
> -	root = debugfs_lookup("tsens", NULL);
> -	if (!root)
> +	priv->debug_root = debugfs_lookup("tsens", NULL);
> +	if (!priv->debug_root)
>   		priv->debug_root = debugfs_create_dir("tsens", NULL);
> -	else
> -		priv->debug_root = root;
>   
> -	file = debugfs_lookup("version", priv->debug_root);
> -	if (!file)
> +	if (!debugfs_lookup("version", priv->debug_root))
>   		debugfs_create_file("version", 0444, priv->debug_root,
>   				    pdev, &dbg_version_fops);
>   
>   	/* A directory for each instance of the TSENS IP */
> -	priv->debug = debugfs_create_dir(dev_name(&pdev->dev), priv->debug_root);

Unconditionally creating priv->debug here is correct. The below if 
(!priv->debug) will never be true because as per your patch 1, we call 
tsens_debug_init once per instance of tsens.

> +	priv->debug = debugfs_lookup(dev_name(&pdev->dev), priv->debug_root);
> +	if (!priv->debug)
> +		priv->debug = debugfs_create_dir(dev_name(&pdev->dev), priv->debug_root);
>   	debugfs_create_file("sensors", 0444, priv->debug, pdev, &dbg_sensors_fops);
>   }
>   #else
> 

-- 
Warm Regards
Thara