[PATCH 3/3] staging: iio: ad5933: use iio_device_attach_kfifo_buffer() helper

[Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>]

This driver calls iio_kfifo_allocate() vs devm_iio_kfifo_allocate(). But
the conversion is still simpler here, and cleans-up/reduces some error
paths.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
 .../staging/iio/impedance-analyzer/ad5933.c   | 28 ++++---------------
 1 file changed, 5 insertions(+), 23 deletions(-)

diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index af0bcf95ee8a..7bde93c6dd74 100644
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -602,22 +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 iio_dev *indio_dev)
-{
-	struct iio_buffer *buffer;
-
-	buffer = iio_kfifo_allocate();
-	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,
@@ -738,26 +722,25 @@ static int ad5933_probe(struct i2c_client *client,
 	indio_dev->dev.parent = &client->dev;
 	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(indio_dev);
+	ret = iio_device_attach_kfifo_buffer(indio_dev, INDIO_BUFFER_SOFTWARE,
+					     &ad5933_ring_setup_ops);
 	if (ret)
 		goto error_disable_mclk;
 
 	ret = ad5933_setup(st);
 	if (ret)
-		goto error_unreg_ring;
+		goto error_disable_mclk;
 
 	ret = iio_device_register(indio_dev);
 	if (ret)
-		goto error_unreg_ring;
+		goto error_disable_mclk;
 
 	return 0;
 
-error_unreg_ring:
-	iio_kfifo_free(indio_dev->buffer);
 error_disable_mclk:
 	clk_disable_unprepare(st->mclk);
 error_disable_reg:
@@ -772,7 +755,6 @@ static int ad5933_remove(struct i2c_client *client)
 	struct ad5933_state *st = iio_priv(indio_dev);
 
 	iio_device_unregister(indio_dev);
-	iio_kfifo_free(indio_dev->buffer);
 	regulator_disable(st->reg);
 	clk_disable_unprepare(st->mclk);
 
-- 
2.17.1