[RFC,22/27] iio: chemical: ens160: Stop using iio_device_claim_direct_scoped()

Commit Message

Jonathan Cameron Jan. 5, 2025, 5:26 p.m. UTC

From: Jonathan Cameron <[e-mail]>

This complex cleanup.h use case of conditional guards has proved
to be more trouble that it is worth in terms of false positive compiler
warnings and hard to read code.

Move directly to the new claim/release_direct() that allow sparse
to check for unbalanced context.

Signed-off-by: Jonathan Cameron <[e-mail]>
---
 drivers/iio/chemical/ens160_core.c | 32 ++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 11 deletions(-)

Patch

diff --git a/drivers/iio/chemical/ens160_core.c b/drivers/iio/chemical/ens160_core.c
index 48d5ad2075b6..152f81ff57e3 100644
--- a/drivers/iio/chemical/ens160_core.c
+++ b/drivers/iio/chemical/ens160_core.c
@@ -100,25 +100,35 @@  static const struct iio_chan_spec ens160_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(2),
 };
 
+static int __ens160_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val)
+{
+	struct ens160_data *data = iio_priv(indio_dev);
+	int ret;
+
+	guard(mutex)(&data->mutex);
+	ret = regmap_bulk_read(data->regmap, chan->address,
+			       &data->buf, sizeof(data->buf));
+	if (ret)
+		return ret;
+	*val = le16_to_cpu(data->buf);
+	return IIO_VAL_INT;
+}
+
 static int ens160_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *chan,
 			   int *val, int *val2, long mask)
 {
-	struct ens160_data *data = iio_priv(indio_dev);
 	int ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
-			guard(mutex)(&data->mutex);
-			ret = regmap_bulk_read(data->regmap, chan->address,
-					       &data->buf, sizeof(data->buf));
-			if (ret)
-				return ret;
-			*val = le16_to_cpu(data->buf);
-			return IIO_VAL_INT;
-		}
-		unreachable();
+		if (!iio_device_claim_direct(indio_dev))
+			return -EBUSY;
+		ret = __ens160_read_raw(indio_dev, chan, val);
+		iio_device_release_direct(indio_dev);
+		return ret;
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->channel2) {
 		case IIO_MOD_CO2: