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Subject: Re: [PATCH 04/15] drivers: thermal: tsens: Add debugfs support
To:     Amit Kucheria <amit.kucheria@linaro.org>
From:   Stephen Boyd <swboyd@chromium.org>
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Date:   Mon, 26 Aug 2019 13:55:51 -0700
Sender: linux-kernel-owner@vger.kernel.org
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Quoting Amit Kucheria (2019-08-21 05:55:39)
> On Mon, Aug 19, 2019 at 7:57 PM Stephen Boyd <swboyd@chromium.org> wrote:
> >
> > Quoting Amit Kucheria (2019-08-19 00:58:23)
> > > On Sat, Aug 17, 2019 at 9:37 AM Stephen Boyd <swboyd@chromium.org> wr=
ote:
> > > > > +
> > > > > +static void tsens_debug_init(struct platform_device *pdev)
> > > > > +{
> > > > > +       struct tsens_priv *priv =3D platform_get_drvdata(pdev);
> > > > > +       struct dentry *root, *file;
> > > > > +
> > > > > +       root =3D 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.
>=20
> So I didn't quite understand this statement. The change you're
> requesting is that the 'root' variable below should be a global?
>=20
> tsens_probe() will get called twice on platforms with two instances of
> the controller. So I will need to check some place if the 'tsens' root
> dir already exists in debugfs, no? That is what I'm doing below.
>=20

Yeah. I was suggesting making a global instead of doing the lookup, but
I guess the lookup is fine and avoids a global variable. It's all
debugfs so it doesn't really matter. Sorry! Do whatever then.