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

[Stephen Boyd]

Quoting Amit Kucheria (2019-08-19 00:58:23)
> On Sat, Aug 17, 2019 at 9:37 AM Stephen Boyd <swboyd@xxxxxxxxxxxx> 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;
> > > +