[RFC PATCH 09/27] iio: adc: ad4000: Stop using iio_device_claim_direct_scoped()

[Jonathan Cameron <jic23@xxxxxxxxxx>]

From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

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 <Jonathan.Cameron@xxxxxxxxxx>
---
 drivers/iio/adc/ad4000.c | 61 +++++++++++++++++++++++++---------------
 1 file changed, 38 insertions(+), 23 deletions(-)

diff --git a/drivers/iio/adc/ad4000.c b/drivers/iio/adc/ad4000.c
index 1d556a842a68..ef0acaafbcdb 100644
--- a/drivers/iio/adc/ad4000.c
+++ b/drivers/iio/adc/ad4000.c
@@ -535,12 +535,16 @@ static int ad4000_read_raw(struct iio_dev *indio_dev,
 			   int *val2, long info)
 {
 	struct ad4000_state *st = iio_priv(indio_dev);
+	int ret;
 
 	switch (info) {
 	case IIO_CHAN_INFO_RAW:
-		iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
-			return ad4000_single_conversion(indio_dev, chan, val);
-		unreachable();
+		if (!iio_device_claim_direct(indio_dev))
+			return -EBUSY;
+
+		ret = ad4000_single_conversion(indio_dev, chan, val);
+		iio_device_release_direct(indio_dev);
+		return ret;
 	case IIO_CHAN_INFO_SCALE:
 		*val = st->scale_tbl[st->span_comp][0];
 		*val2 = st->scale_tbl[st->span_comp][1];
@@ -585,36 +589,47 @@ static int ad4000_write_raw_get_fmt(struct iio_dev *indio_dev,
 	}
 }
 
-static int ad4000_write_raw(struct iio_dev *indio_dev,
-			    struct iio_chan_spec const *chan, int val, int val2,
-			    long mask)
+static int __ad4000_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val2)
 {
 	struct ad4000_state *st = iio_priv(indio_dev);
 	unsigned int reg_val;
 	bool span_comp_en;
 	int ret;
 
-	switch (mask) {
-	case IIO_CHAN_INFO_SCALE:
-		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
-			guard(mutex)(&st->lock);
+	guard(mutex)(&st->lock);
 
-			ret = ad4000_read_reg(st, &reg_val);
-			if (ret < 0)
-				return ret;
+	ret = ad4000_read_reg(st, &reg_val);
+	if (ret < 0)
+		return ret;
 
-			span_comp_en = val2 == st->scale_tbl[1][1];
-			reg_val &= ~AD4000_CFG_SPAN_COMP;
-			reg_val |= FIELD_PREP(AD4000_CFG_SPAN_COMP, span_comp_en);
+	span_comp_en = val2 == st->scale_tbl[1][1];
+	reg_val &= ~AD4000_CFG_SPAN_COMP;
+	reg_val |= FIELD_PREP(AD4000_CFG_SPAN_COMP, span_comp_en);
 
-			ret = ad4000_write_reg(st, reg_val);
-			if (ret < 0)
-				return ret;
+	ret = ad4000_write_reg(st, reg_val);
+	if (ret < 0)
+		return ret;
 
-			st->span_comp = span_comp_en;
-			return 0;
-		}
-		unreachable();
+	st->span_comp = span_comp_en;
+	return 0;
+}
+
+static int ad4000_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long mask)
+{
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+
+		if (!iio_device_claim_direct(indio_dev))
+			return -EBUSY;
+		ret = __ad4000_write_raw(indio_dev, chan, val2);
+		iio_device_release_direct(indio_dev);
+		return ret;
 	default:
 		return -EINVAL;
 	}
-- 
2.47.1