linux-kernel - Re: [PATCH v3] iio:imu:bmi160: disable regulator in error path

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Date:   Sun, 27 Mar 2022 08:58:36 -0700
From:   Tong Zhang <ztong0001@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sean Nyekjaer <sean@...nix.com>,
        Alexandru Ardelean <ardeleanalex@...il.com>,
        Jonathan Albrieux <jonathan.albrieux@...il.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] iio:imu:bmi160: disable regulator in error path

On Sun, Mar 27, 2022 at 8:46 AM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Sun, 27 Mar 2022 08:40:05 -0700
> Tong Zhang <ztong0001@...il.com> wrote:
>
> > Regulator should be disabled in error path as mentioned in _regulator_put().
> > Also disable accel if gyro cannot be enabled.
> >
> > [   16.233604] WARNING: CPU: 0 PID: 2177 at drivers/regulator/core.c:2257 _regulator_put
> > [   16.240453] Call Trace:
> > [   16.240572]  <TASK>
> > [   16.240676]  regulator_put+0x26/0x40
> > [   16.240853]  regulator_bulk_free+0x26/0x50
> > [   16.241050]  release_nodes+0x3f/0x70
> > [   16.241225]  devres_release_group+0x147/0x1c0
> > [   16.241441]  ? bmi160_core_probe+0x175/0x3a0 [bmi160_core]
> >
> > Fixes: 5dea3fb066f0 ("iio: imu: bmi160: added regulator support")
> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Signed-off-by: Tong Zhang <ztong0001@...il.com>
> oops. Raced with you ;)
>
> Anyhow, I added the tag, so no problem.
>
> Jonathan

No problem. Have a nice weekend!:-)
- Tong

>
> > ---
> > v2: also disable accel when gyro fail to enable
> > v3: add tag
> >  drivers/iio/imu/bmi160/bmi160_core.c | 20 ++++++++++++++------
> >  1 file changed, 14 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
> > index 824b5124a5f5..01336105792e 100644
> > --- a/drivers/iio/imu/bmi160/bmi160_core.c
> > +++ b/drivers/iio/imu/bmi160/bmi160_core.c
> > @@ -730,7 +730,7 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
> >
> >       ret = regmap_write(data->regmap, BMI160_REG_CMD, BMI160_CMD_SOFTRESET);
> >       if (ret)
> > -             return ret;
> > +             goto disable_regulator;
> >
> >       usleep_range(BMI160_SOFTRESET_USLEEP, BMI160_SOFTRESET_USLEEP + 1);
> >
> > @@ -741,29 +741,37 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
> >       if (use_spi) {
> >               ret = regmap_read(data->regmap, BMI160_REG_DUMMY, &val);
> >               if (ret)
> > -                     return ret;
> > +                     goto disable_regulator;
> >       }
> >
> >       ret = regmap_read(data->regmap, BMI160_REG_CHIP_ID, &val);
> >       if (ret) {
> >               dev_err(dev, "Error reading chip id\n");
> > -             return ret;
> > +             goto disable_regulator;
> >       }
> >       if (val != BMI160_CHIP_ID_VAL) {
> >               dev_err(dev, "Wrong chip id, got %x expected %x\n",
> >                       val, BMI160_CHIP_ID_VAL);
> > -             return -ENODEV;
> > +             ret = -ENODEV;
> > +             goto disable_regulator;
> >       }
> >
> >       ret = bmi160_set_mode(data, BMI160_ACCEL, true);
> >       if (ret)
> > -             return ret;
> > +             goto disable_regulator;
> >
> >       ret = bmi160_set_mode(data, BMI160_GYRO, true);
> >       if (ret)
> > -             return ret;
> > +             goto disable_accel;
> >
> >       return 0;
> > +
> > +disable_accel:
> > +     bmi160_set_mode(data, BMI160_ACCEL, false);
> > +
> > +disable_regulator:
> > +     regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
> > +     return ret;
> >  }
> >
> >  static int bmi160_data_rdy_trigger_set_state(struct iio_trigger *trig,
>