Re: [PATCH v6 03/24] iio: make use of devm_iio_kfifo_buffer_setup() helper

From: Gwendal Grignou
Date: Tue Feb 16 2021 - 18:51:41 EST

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Reviewed-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>

On Mon, Feb 15, 2021 at 4:11 AM Jonathan Cameron <jic23@xxxxxxxxxx> wrote:
>
> On Mon, 15 Feb 2021 12:40:22 +0200
> Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote:
>
> > All drivers that already call devm_iio_kfifo_allocate() &
> > iio_device_attach_buffer() are simple to convert to
> > iio_device_attach_kfifo_buffer() in a single go.
> >
> > This change does that; the unwind order is preserved.
> > What is important, is that the devm_iio_kfifo_buffer_setup() be called
> > after the indio_dev->modes is assigned, to make sure that
> > INDIO_BUFFER_SOFTWARE flag is set and not overridden by the assignment to
> > indio_dev->modes.
> >
> > Also, the INDIO_BUFFER_SOFTWARE has been removed from the assignments of
> > 'indio_dev->modes' because it is set by devm_iio_kfifo_buffer_setup().
> >
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
> I 'think' this one is is in the obviously correct category so I've
> applied it to the togreg branch of iio.git and pushed out as testing.
> Note there is still plenty of time for any additional feedback,
> particularly as the CC list was a little sparse.
>
> I've +CCd those who I know are still active maintainers of some
> of the affected drivers.
>
> Jonathan
>
> > ---
> > drivers/iio/accel/ssp_accel_sensor.c | 14 ++++-------
> > drivers/iio/adc/ina2xx-adc.c | 14 +++++------
> > drivers/iio/adc/ti_am335x_adc.c | 18 ++++-----------
> > .../cros_ec_sensors/cros_ec_sensors_core.c | 13 ++++-------
> > drivers/iio/gyro/ssp_gyro_sensor.c | 14 ++++-------
> > drivers/iio/health/max30100.c | 16 ++++++-------
> > drivers/iio/health/max30102.c | 16 ++++++-------
> > .../iio/imu/inv_icm42600/inv_icm42600_accel.c | 14 +++++------
> > .../iio/imu/inv_icm42600/inv_icm42600_gyro.c | 13 +++++------
> > .../iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 15 +++++-------
> > drivers/iio/light/acpi-als.c | 12 ++++------
> > drivers/iio/light/apds9960.c | 16 ++++++-------
> > .../staging/iio/impedance-analyzer/ad5933.c | 23 ++++---------------
> > 13 files changed, 74 insertions(+), 124 deletions(-)
> >
> > diff --git a/drivers/iio/accel/ssp_accel_sensor.c b/drivers/iio/accel/ssp_accel_sensor.c
> > index 474477e91b5e..04dcb2b657ee 100644
> > --- a/drivers/iio/accel/ssp_accel_sensor.c
> > +++ b/drivers/iio/accel/ssp_accel_sensor.c
> > @@ -96,7 +96,6 @@ static int ssp_accel_probe(struct platform_device *pdev)
> > int ret;
> > struct iio_dev *indio_dev;
> > struct ssp_sensor_data *spd;
> > - struct iio_buffer *buffer;
> >
> > indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
> > if (!indio_dev)
> > @@ -109,18 +108,15 @@ static int ssp_accel_probe(struct platform_device *pdev)
> >
> > indio_dev->name = ssp_accel_device_name;
> > indio_dev->info = &ssp_accel_iio_info;
> > - indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> > indio_dev->channels = ssp_acc_channels;
> > indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
> > indio_dev->available_scan_masks = ssp_accel_scan_mask;
> >
> > - buffer = devm_iio_kfifo_allocate(&pdev->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > - indio_dev->setup_ops = &ssp_accel_buffer_ops;
> > + ret = devm_iio_kfifo_buffer_setup(&pdev->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &ssp_accel_buffer_ops);
> > + if (ret)
> > + return ret;
> >
> > platform_set_drvdata(pdev, indio_dev);
> >
> > diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
> > index b573ec60a8b8..2ae54258b221 100644
> > --- a/drivers/iio/adc/ina2xx-adc.c
> > +++ b/drivers/iio/adc/ina2xx-adc.c
> > @@ -953,7 +953,6 @@ static int ina2xx_probe(struct i2c_client *client,
> > {
> > struct ina2xx_chip_info *chip;
> > struct iio_dev *indio_dev;
> > - struct iio_buffer *buffer;
> > unsigned int val;
> > enum ina2xx_ids type;
> > int ret;
> > @@ -1017,7 +1016,7 @@ static int ina2xx_probe(struct i2c_client *client,
> > return ret;
> > }
> >
> > - indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > if (id->driver_data == ina226) {
> > indio_dev->channels = ina226_channels;
> > indio_dev->num_channels = ARRAY_SIZE(ina226_channels);
> > @@ -1028,13 +1027,12 @@ static int ina2xx_probe(struct i2c_client *client,
> > indio_dev->info = &ina219_info;
> > }
> > indio_dev->name = id->name;
> > - indio_dev->setup_ops = &ina2xx_setup_ops;
> >
> > - buffer = devm_iio_kfifo_allocate(&indio_dev->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > + ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &ina2xx_setup_ops);
> > + if (ret)
> > + return ret;
> >
> > return iio_device_register(indio_dev);
> > }
> > diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> > index e946903b0993..855cc2d64ac8 100644
> > --- a/drivers/iio/adc/ti_am335x_adc.c
> > +++ b/drivers/iio/adc/ti_am335x_adc.c
> > @@ -385,24 +385,16 @@ static int tiadc_iio_buffered_hardware_setup(struct device *dev,
> > unsigned long flags,
> > const struct iio_buffer_setup_ops *setup_ops)
> > {
> > - struct iio_buffer *buffer;
> > int ret;
> >
> > - buffer = devm_iio_kfifo_allocate(dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > - ret = devm_request_threaded_irq(dev, irq, pollfunc_th, pollfunc_bh,
> > - flags, indio_dev->name, indio_dev);
> > + ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + setup_ops);
> > if (ret)
> > return ret;
> >
> > - indio_dev->setup_ops = setup_ops;
> > - indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
> > -
> > - return 0;
> > + return devm_request_threaded_irq(dev, irq, pollfunc_th, pollfunc_bh,
> > + flags, indio_dev->name, indio_dev);
> > }
> >
> > static const char * const chan_name_ain[] = {
> > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > index c833ec0ef214..f8824afe595e 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > @@ -334,14 +334,11 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> > * We can not use trigger here, as events are generated
> > * as soon as sample_frequency is set.
> > */
> > - struct iio_buffer *buffer;
> > -
> > - buffer = devm_iio_kfifo_allocate(dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > - indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> > + ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + NULL);
> > + if (ret)
> > + return ret;
> >
> > ret = cros_ec_sensorhub_register_push_data(
> > sensor_hub, sensor_platform->sensor_num,
> > diff --git a/drivers/iio/gyro/ssp_gyro_sensor.c b/drivers/iio/gyro/ssp_gyro_sensor.c
> > index ac7c170a20de..46ed12771d2f 100644
> > --- a/drivers/iio/gyro/ssp_gyro_sensor.c
> > +++ b/drivers/iio/gyro/ssp_gyro_sensor.c
> > @@ -96,7 +96,6 @@ static int ssp_gyro_probe(struct platform_device *pdev)
> > int ret;
> > struct iio_dev *indio_dev;
> > struct ssp_sensor_data *spd;
> > - struct iio_buffer *buffer;
> >
> > indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
> > if (!indio_dev)
> > @@ -109,18 +108,15 @@ static int ssp_gyro_probe(struct platform_device *pdev)
> >
> > indio_dev->name = ssp_gyro_name;
> > indio_dev->info = &ssp_gyro_iio_info;
> > - indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> > indio_dev->channels = ssp_gyro_channels;
> > indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
> > indio_dev->available_scan_masks = ssp_gyro_scan_mask;
> >
> > - buffer = devm_iio_kfifo_allocate(&pdev->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > - indio_dev->setup_ops = &ssp_gyro_buffer_ops;
> > + ret = devm_iio_kfifo_buffer_setup(&pdev->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &ssp_gyro_buffer_ops);
> > + if (ret)
> > + return ret;
> >
> > platform_set_drvdata(pdev, indio_dev);
> >
> > diff --git a/drivers/iio/health/max30100.c b/drivers/iio/health/max30100.c
> > index 38aa2030f3c6..36ba7611d9ce 100644
> > --- a/drivers/iio/health/max30100.c
> > +++ b/drivers/iio/health/max30100.c
> > @@ -418,7 +418,6 @@ static int max30100_probe(struct i2c_client *client,
> > const struct i2c_device_id *id)
> > {
> > struct max30100_data *data;
> > - struct iio_buffer *buffer;
> > struct iio_dev *indio_dev;
> > int ret;
> >
> > @@ -426,19 +425,18 @@ static int max30100_probe(struct i2c_client *client,
> > if (!indio_dev)
> > return -ENOMEM;
> >
> > - buffer = devm_iio_kfifo_allocate(&client->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > indio_dev->name = MAX30100_DRV_NAME;
> > indio_dev->channels = max30100_channels;
> > indio_dev->info = &max30100_info;
> > indio_dev->num_channels = ARRAY_SIZE(max30100_channels);
> > indio_dev->available_scan_masks = max30100_scan_masks;
> > - indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
> > - indio_dev->setup_ops = &max30100_buffer_setup_ops;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > +
> > + ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &max30100_buffer_setup_ops);
> > + if (ret)
> > + return ret;
> >
> > data = iio_priv(indio_dev);
> > data->indio_dev = indio_dev;
> > diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c
> > index b35557a54ee2..2292876c55e2 100644
> > --- a/drivers/iio/health/max30102.c
> > +++ b/drivers/iio/health/max30102.c
> > @@ -506,7 +506,6 @@ static int max30102_probe(struct i2c_client *client,
> > const struct i2c_device_id *id)
> > {
> > struct max30102_data *data;
> > - struct iio_buffer *buffer;
> > struct iio_dev *indio_dev;
> > int ret;
> > unsigned int reg;
> > @@ -515,16 +514,9 @@ static int max30102_probe(struct i2c_client *client,
> > if (!indio_dev)
> > return -ENOMEM;
> >
> > - buffer = devm_iio_kfifo_allocate(&client->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > indio_dev->name = MAX30102_DRV_NAME;
> > indio_dev->info = &max30102_info;
> > - indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
> > - indio_dev->setup_ops = &max30102_buffer_setup_ops;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> >
> > data = iio_priv(indio_dev);
> > data->indio_dev = indio_dev;
> > @@ -549,6 +541,12 @@ static int max30102_probe(struct i2c_client *client,
> > return -ENODEV;
> > }
> >
> > + ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &max30102_buffer_setup_ops);
> > + if (ret)
> > + return ret;
> > +
> > data->regmap = devm_regmap_init_i2c(client, &max30102_regmap_config);
> > if (IS_ERR(data->regmap)) {
> > dev_err(&client->dev, "regmap initialization failed\n");
> > diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
> > index 3441b0d61c5d..383cc3250342 100644
> > --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
> > +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
> > @@ -709,7 +709,6 @@ struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st)
> > const char *name;
> > struct inv_icm42600_timestamp *ts;
> > struct iio_dev *indio_dev;
> > - struct iio_buffer *buffer;
> > int ret;
> >
> > name = devm_kasprintf(dev, GFP_KERNEL, "%s-accel", st->name);
> > @@ -720,23 +719,22 @@ struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st)
> > if (!indio_dev)
> > return ERR_PTR(-ENOMEM);
> >
> > - buffer = devm_iio_kfifo_allocate(dev);
> > - if (!buffer)
> > - return ERR_PTR(-ENOMEM);
> > -
> > ts = iio_priv(indio_dev);
> > inv_icm42600_timestamp_init(ts, inv_icm42600_odr_to_period(st->conf.accel.odr));
> >
> > iio_device_set_drvdata(indio_dev, st);
> > indio_dev->name = name;
> > indio_dev->info = &inv_icm42600_accel_info;
> > - indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > indio_dev->channels = inv_icm42600_accel_channels;
> > indio_dev->num_channels = ARRAY_SIZE(inv_icm42600_accel_channels);
> > indio_dev->available_scan_masks = inv_icm42600_accel_scan_masks;
> > - indio_dev->setup_ops = &inv_icm42600_buffer_ops;
> >
> > - iio_device_attach_buffer(indio_dev, buffer);
> > + ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &inv_icm42600_buffer_ops);
> > + if (ret)
> > + return ERR_PTR(ret);
> >
> > ret = devm_iio_device_register(dev, indio_dev);
> > if (ret)
> > diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_gyro.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_gyro.c
> > index aee7b9ff4bf4..cec1dd0e0464 100644
> > --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_gyro.c
> > +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_gyro.c
> > @@ -720,7 +720,6 @@ struct iio_dev *inv_icm42600_gyro_init(struct inv_icm42600_state *st)
> > const char *name;
> > struct inv_icm42600_timestamp *ts;
> > struct iio_dev *indio_dev;
> > - struct iio_buffer *buffer;
> > int ret;
> >
> > name = devm_kasprintf(dev, GFP_KERNEL, "%s-gyro", st->name);
> > @@ -731,23 +730,23 @@ struct iio_dev *inv_icm42600_gyro_init(struct inv_icm42600_state *st)
> > if (!indio_dev)
> > return ERR_PTR(-ENOMEM);
> >
> > - buffer = devm_iio_kfifo_allocate(dev);
> > - if (!buffer)
> > - return ERR_PTR(-ENOMEM);
> > -
> > ts = iio_priv(indio_dev);
> > inv_icm42600_timestamp_init(ts, inv_icm42600_odr_to_period(st->conf.gyro.odr));
> >
> > iio_device_set_drvdata(indio_dev, st);
> > indio_dev->name = name;
> > indio_dev->info = &inv_icm42600_gyro_info;
> > - indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > indio_dev->channels = inv_icm42600_gyro_channels;
> > indio_dev->num_channels = ARRAY_SIZE(inv_icm42600_gyro_channels);
> > indio_dev->available_scan_masks = inv_icm42600_gyro_scan_masks;
> > indio_dev->setup_ops = &inv_icm42600_buffer_ops;
> >
> > - iio_device_attach_buffer(indio_dev, buffer);
> > + ret = devm_iio_kfifo_buffer_setup(dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &inv_icm42600_buffer_ops);
> > + if (ret)
> > + return ERR_PTR(ret);
> >
> > ret = devm_iio_device_register(dev, indio_dev);
> > if (ret)
> > diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > index f1103ecedd64..16730a780964 100644
> > --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
> > @@ -739,20 +739,17 @@ static const struct iio_buffer_setup_ops st_lsm6dsx_buffer_ops = {
> >
> > int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw)
> > {
> > - struct iio_buffer *buffer;
> > - int i;
> > + int i, ret;
> >
> > for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
> > if (!hw->iio_devs[i])
> > continue;
> >
> > - buffer = devm_iio_kfifo_allocate(hw->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(hw->iio_devs[i], buffer);
> > - hw->iio_devs[i]->modes |= INDIO_BUFFER_SOFTWARE;
> > - hw->iio_devs[i]->setup_ops = &st_lsm6dsx_buffer_ops;
> > + ret = devm_iio_kfifo_buffer_setup(hw->dev, hw->iio_devs[i],
> > + INDIO_BUFFER_SOFTWARE,
> > + &st_lsm6dsx_buffer_ops);
> > + if (ret)
> > + return ret;
> > }
> >
> > return 0;
> > diff --git a/drivers/iio/light/acpi-als.c b/drivers/iio/light/acpi-als.c
> > index 2be7180e2cbf..f8e547fd35e7 100644
> > --- a/drivers/iio/light/acpi-als.c
> > +++ b/drivers/iio/light/acpi-als.c
> > @@ -165,7 +165,7 @@ static int acpi_als_add(struct acpi_device *device)
> > {
> > struct acpi_als *als;
> > struct iio_dev *indio_dev;
> > - struct iio_buffer *buffer;
> > + int ret;
> >
> > indio_dev = devm_iio_device_alloc(&device->dev, sizeof(*als));
> > if (!indio_dev)
> > @@ -179,15 +179,13 @@ static int acpi_als_add(struct acpi_device *device)
> >
> > indio_dev->name = ACPI_ALS_DEVICE_NAME;
> > indio_dev->info = &acpi_als_info;
> > - indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> > indio_dev->channels = acpi_als_channels;
> > indio_dev->num_channels = ARRAY_SIZE(acpi_als_channels);
> >
> > - buffer = devm_iio_kfifo_allocate(&device->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > + ret = devm_iio_kfifo_buffer_setup(&device->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE, NULL);
> > + if (ret)
> > + return ret;
> >
> > return devm_iio_device_register(&device->dev, indio_dev);
> > }
> > diff --git a/drivers/iio/light/apds9960.c b/drivers/iio/light/apds9960.c
> > index df0647856e5d..4141c0fa7bc4 100644
> > --- a/drivers/iio/light/apds9960.c
> > +++ b/drivers/iio/light/apds9960.c
> > @@ -988,7 +988,6 @@ static int apds9960_probe(struct i2c_client *client,
> > const struct i2c_device_id *id)
> > {
> > struct apds9960_data *data;
> > - struct iio_buffer *buffer;
> > struct iio_dev *indio_dev;
> > int ret;
> >
> > @@ -996,19 +995,18 @@ static int apds9960_probe(struct i2c_client *client,
> > if (!indio_dev)
> > return -ENOMEM;
> >
> > - buffer = devm_iio_kfifo_allocate(&client->dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > indio_dev->info = &apds9960_info;
> > indio_dev->name = APDS9960_DRV_NAME;
> > indio_dev->channels = apds9960_channels;
> > indio_dev->num_channels = ARRAY_SIZE(apds9960_channels);
> > indio_dev->available_scan_masks = apds9960_scan_masks;
> > - indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
> > - indio_dev->setup_ops = &apds9960_buffer_setup_ops;
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > +
> > + ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &apds9960_buffer_setup_ops);
> > + if (ret)
> > + return ret;
> >
> > data = iio_priv(indio_dev);
> > i2c_set_clientdata(client, indio_dev);
> > diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
> > index dba78896ea8f..793918e1c45f 100644
> > --- a/drivers/staging/iio/impedance-analyzer/ad5933.c
> > +++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
> > @@ -602,23 +602,6 @@ static const struct iio_buffer_setup_ops ad5933_ring_setup_ops = {
> > .postdisable = ad5933_ring_postdisable,
> > };
> >
> > -static int ad5933_register_ring_funcs_and_init(struct device *dev,
> > - struct iio_dev *indio_dev)
> > -{
> > - struct iio_buffer *buffer;
> > -
> > - buffer = devm_iio_kfifo_allocate(dev);
> > - if (!buffer)
> > - return -ENOMEM;
> > -
> > - iio_device_attach_buffer(indio_dev, buffer);
> > -
> > - /* Ring buffer functions - here trigger setup related */
> > - indio_dev->setup_ops = &ad5933_ring_setup_ops;
> > -
> > - return 0;
> > -}
> > -
> > static void ad5933_work(struct work_struct *work)
> > {
> > struct ad5933_state *st = container_of(work,
> > @@ -761,11 +744,13 @@ static int ad5933_probe(struct i2c_client *client,
> >
> > indio_dev->info = &ad5933_info;
> > indio_dev->name = id->name;
> > - indio_dev->modes = (INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE);
> > + indio_dev->modes = INDIO_DIRECT_MODE;
> > indio_dev->channels = ad5933_channels;
> > indio_dev->num_channels = ARRAY_SIZE(ad5933_channels);
> >
> > - ret = ad5933_register_ring_funcs_and_init(&client->dev, indio_dev);
> > + ret = devm_iio_kfifo_buffer_setup(&client->dev, indio_dev,
> > + INDIO_BUFFER_SOFTWARE,
> > + &ad5933_ring_setup_ops);
> > if (ret)
> > return ret;
> >
>

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