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

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Date:   Wed, 28 Apr 2021 15:23:47 -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



On 4/28/21 3:19 PM, Ansuel Smith wrote:
> On Wed, Apr 28, 2021 at 03:14:31PM -0400, Thara Gopinath wrote:
>>
>>
>> On 4/28/21 2:48 PM, Ansuel Smith wrote:
>>> On Wed, Apr 28, 2021 at 12:47:30PM -0400, Thara Gopinath wrote:
>>>> Hi,
>>>>
>>>> Please include a cover letter next time describing the patch series.
>>>>
>>>
>>> Yes sorry, I tought that for a small series (2 patch) it wasn't needed.
>>>
>>>> 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.
>>>>
>>>
>>> You are right, will send a v2 if everything else is good. What do you
>>> think?
>>
>> I have not tested this yet. The clean up itself looks okay to me.
>> My question is have you tried this with 8960 tsens ? That is the only
>> version of tsens that does not use init_common and hence looks to me that a
>> debug interface is not created. I don't think this should be a problem
>> though. So if you can fix the above, it is a go ahead from me.
>>
> 
> Recent commits should have switched 8960 to init_common. Actually I
> pushed this cause while testing 8960 I notice the warning about
> double debugfs. Anyway thx for the review. Will send v2 ASAP.

Sounds good. Thanks.

> 
>>
>> -- 
>> Warm Regards
>> Thara

-- 
Warm Regards
Thara