linux-kernel - Re: [PATCH 04/15] drivers: thermal: tsens: Add debugfs support

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Date:   Mon, 19 Aug 2019 07:27:43 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 04/15] drivers: thermal: tsens: Add debugfs support

Quoting Amit Kucheria (2019-08-19 00:58:23)
> On Sat, Aug 17, 2019 at 9:37 AM Stephen Boyd <swboyd@...omium.org> wrote:
> > > +
> > > +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);
> >
> > Does this get created many times? Why doesn't tsens have a pointer to
> > the root saved away somewhere globally?
> >
> 
> I guess we could call the statement below to create the root dir and
> save away the pointer. I was trying to avoid #ifdef CONFIG_DEBUG_FS in
> init_common() and instead have all of it in a single function that
> gets called once per instance of the tsens controller.

Or call this code many times and try to create the tsens node if
!tsens_root exists where the variable is some global.

> 
> > > +       if (!root)
> > > +               priv->debug_root = debugfs_create_dir("tsens", NULL);
> > > +       else
> > > +               priv->debug_root = root;
> > > +