linux-kernel - Re: [PATCH] input: cypress-sf: Register a callback to disable the regulators

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Date:   Sat, 9 Apr 2022 10:56:21 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     y.oudjana@...tonmail.com, linux-input@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] input: cypress-sf: Register a callback to disable the regulators

On Sat, Apr 9, 2022 at 10:34 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> Hi Zheyu,
>
> On Sat, Apr 09, 2022 at 10:26:29AM +0800, Zheyu Ma wrote:
> > When the driver fails to probe, we will get the following splat:
> >
> > [   19.311970] ------------[ cut here ]------------
> > [   19.312566] WARNING: CPU: 3 PID: 375 at drivers/regulator/core.c:2257 _regulator_put+0x3ec/0x4e0
> > [   19.317591] RIP: 0010:_regulator_put+0x3ec/0x4e0
> > [   19.328831] Call Trace:
> > [   19.329112]  <TASK>
> > [   19.329369]  regulator_bulk_free+0x82/0xe0
> > [   19.329860]  devres_release_group+0x319/0x3d0
> > [   19.330357]  i2c_device_probe+0x766/0x940
> >
> > Fix this by adding a callback that will deal with the disabling when the
> > driver fails to probe.
> >
> > Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
> > ---
> >  drivers/input/keyboard/cypress-sf.c | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> > diff --git a/drivers/input/keyboard/cypress-sf.c b/drivers/input/keyboard/cypress-sf.c
> > index c28996028e80..798611b76de6 100644
> > --- a/drivers/input/keyboard/cypress-sf.c
> > +++ b/drivers/input/keyboard/cypress-sf.c
> > @@ -61,6 +61,13 @@ static irqreturn_t cypress_sf_irq_handler(int irq, void *devid)
> >       return IRQ_HANDLED;
> >  }
> >
> > +static void cypress_sf_disable_regulator(void *arg)
> > +{
> > +     struct cypress_sf_data *data = arg;
> > +
> > +     regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
> > +}
> > +
> >  static int cypress_sf_probe(struct i2c_client *client)
> >  {
> >       struct cypress_sf_data *touchkey;
> > @@ -84,6 +91,10 @@ static int cypress_sf_probe(struct i2c_client *client)
> >               return error;
> >       }
> >
> > +     error = devm_add_action_or_reset(&client->dev, cypress_sf_disable_regulator, touchkey);
> > +     if (error)
> > +             return error;
>
> This needs to be moved to the spot after we enabled regulators. I
> adjusted and applied.

Thanks for your reminder!

Zheyu Ma