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

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Date:   Wed, 28 Apr 2021 21:19:13 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Thara Gopinath <thara.gopinath@...aro.org>
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 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.

> 
> -- 
> Warm Regards
> Thara