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

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Date:   Wed, 28 Apr 2021 21:44:27 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>,
        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>, 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

On 28/04/2021 18:47, Thara Gopinath wrote:
> Hi,
> 
> Please include a cover letter next time describing the patch series.

Yes, a cover letter helps for the understanding of a patch series but in
this case the changes are simple enough to get rid of it.

> 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
>>
> 


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