On Fri, 13 May 2022 22:35:13 +0800 Zheyu Ma <zheyuma97@xxxxxxxxx> wrote: > When the driver fails in bmi160_chip_init(), it should disable the > regulator. > > The following log shows it: > > [ 18.709662] WARNING: CPU: 0 PID: 294 at drivers/regulator/core.c:2257 _regulator_put+0x3ec/0x4e0 > [ 18.712069] RIP: 0010:_regulator_put+0x3ec/0x4e0 > [ 18.716395] Call Trace: > [ 18.716522] <TASK> > [ 18.716636] regulator_bulk_free+0x82/0xe0 > [ 18.717077] i2c_device_probe+0x6f0/0x800 > > Fixes: 5dea3fb066f0 ("iio: imu: bmi160: added regulator support") > Signed-off-by: Zheyu Ma <zheyuma97@xxxxxxxxx> Hi, Good find, but Tong Zhang got their first and the resulting patch fixes an additional issue missed in this fix. See below. Jonathan > --- > drivers/iio/imu/bmi160/bmi160_core.c | 17 +++++++++++------ > 1 file changed, 11 insertions(+), 6 deletions(-) > > diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c > index 824b5124a5f5..33abfc2bbd7c 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 err_regulator_disable; > > usleep_range(BMI160_SOFTRESET_USLEEP, BMI160_SOFTRESET_USLEEP + 1); > > @@ -741,29 +741,34 @@ 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 err_regulator_disable; > } > > ret = regmap_read(data->regmap, BMI160_REG_CHIP_ID, &val); > if (ret) { > dev_err(dev, "Error reading chip id\n"); > - return ret; > + goto err_regulator_disable; > } > 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 err_regulator_disable; > } > > ret = bmi160_set_mode(data, BMI160_ACCEL, true); > if (ret) > - return ret; > + goto err_regulator_disable; > > ret = bmi160_set_mode(data, BMI160_GYRO, true); > if (ret) A failure here does not disable the accelerometer (which is done in the uninit() function which we we never end up running. > - return ret; > + goto err_regulator_disable; > > return 0; > + > +err_regulator_disable: > + regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies); > + return ret; > } > > static int bmi160_data_rdy_trigger_set_state(struct iio_trigger *trig,