linux-kernel - Re: [PATCH v2 5/5] iio: sx9310: Enable vdd and svdd regulators at probe

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Date:   Fri, 24 Jul 2020 17:38:36 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Daniel Campello <campello@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Subject: Re: [PATCH v2 5/5] iio: sx9310: Enable vdd and svdd regulators at probe

Quoting Doug Anderson (2020-07-24 15:02:23)
> On Fri, Jul 24, 2020 at 2:33 PM Stephen Boyd <swboyd@...omium.org> wrote:
> > diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> > index 1e1f6bba50f6..ad6ed100c7a6 100644
> > --- a/drivers/iio/proximity/sx9310.c
> > +++ b/drivers/iio/proximity/sx9310.c
> > @@ -919,6 +929,23 @@ static int sx9310_probe(struct i2c_client *client,
> >         if (IS_ERR(data->regmap))
> >                 return PTR_ERR(data->regmap);
> >
> > +       ret = devm_regulator_bulk_get(&client->dev, ARRAY_SIZE(supplies), supplies);
> > +       if (ret)
> > +               return ret;
> > +
> > +       ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
> > +       if (ret)
> > +               return ret;
> > +       /* Must wait for Tpor time after initial power up */
> > +       usleep_range(1000, 1100);
> > +
> > +       /* Update sx9310_regulator_disable() size if this bug is hit */
> > +       BUILD_BUG_ON(ARRAY_SIZE(supplies) != 2);
> > +       ret = devm_add_action_or_reset(&client->dev, sx9310_regulator_disable,
> > +                                      supplies);
> 
> ...but, but...  Aren't you storing a pointer to stack memory?  How
> does that work?  I think you either need to store the "struct
> regulator_bulk_data" in your private data or just make two normal
> regulator calls.
> 

Doh, no coffee today.