[PATCH v2] iio: chemical: sps30: Replace manual locking with RAII locking

[Maxwell Doose <m32285159@gmail.com>]

Replace manual mutex_lock() and mutex_unlock() calls with the much newer
guard(mutex)() and scoped_guard() macros to enable RAII patterns,
modernize the driver, and to increase readability.

Add new wrapper sps30_do_meas() for cleaner locking, and rename existing
sps30_do_meas() to __sps30_do_meas() to denote locking requirements.

Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Signed-off-by: Maxwell Doose <m32285159@gmail.com>
---
 v2:
 - Switch over some scoped_guard()s to guard(mutex)() per David's
   suggestion.
 - Remove redundant whitespace per Andy's suggestion.
 - Add new wrapper sps30_do_meas() per Andy's suggestion (see commit
   message).
 - Add Joshua's RB
   (link: https://lore.kernel.org/linux-iio/CAKqfh0FWig8mRR-xhvnfcFeSinR6RySyPaf9Gbpb6WU+diiiUQ@mail.gmail.com/T/#t)

 drivers/iio/chemical/sps30.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
index a934bf0298dd..1c44524be1cf 100644
--- a/drivers/iio/chemical/sps30.c
+++ b/drivers/iio/chemical/sps30.c
@@ -5,6 +5,7 @@
  * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
  */
 
+#include <linux/cleanup.h>
 #include <linux/crc8.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
@@ -65,7 +66,7 @@ static s32 sps30_float_to_int_clamped(__be32 *fp)
 	return val * 100 + ((fraction * 100) >> shift);
 }
 
-static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
+static int __sps30_do_meas(struct sps30_state *state, s32 *data, int size)
 {
 	int i, ret;
 
@@ -87,6 +88,12 @@ static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
 	return 0;
 }
 
+static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
+{
+	guard(mutex)(&state->lock);
+	return __sps30_do_meas(state, data, size);
+}
+
 static int sps30_do_reset(struct sps30_state *state)
 {
 	int ret;
@@ -111,9 +118,7 @@ static irqreturn_t sps30_trigger_handler(int irq, void *p)
 		aligned_s64 ts;
 	} scan;
 
-	mutex_lock(&state->lock);
 	ret = sps30_do_meas(state, scan.data, ARRAY_SIZE(scan.data));
-	mutex_unlock(&state->lock);
 	if (ret)
 		goto err;
 
@@ -136,7 +141,6 @@ static int sps30_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_PROCESSED:
 		switch (chan->type) {
 		case IIO_MASSCONCENTRATION:
-			mutex_lock(&state->lock);
 			/* read up to the number of bytes actually needed */
 			switch (chan->channel2) {
 			case IIO_MOD_PM1:
@@ -152,7 +156,6 @@ static int sps30_read_raw(struct iio_dev *indio_dev,
 				ret = sps30_do_meas(state, data, 4);
 				break;
 			}
-			mutex_unlock(&state->lock);
 			if (ret)
 				return ret;
 
@@ -197,9 +200,9 @@ static ssize_t start_cleaning_store(struct device *dev,
 	if (kstrtoint(buf, 0, &val) || val != 1)
 		return -EINVAL;
 
-	mutex_lock(&state->lock);
+	guard(mutex)(&state->lock);
+
 	ret = state->ops->clean_fan(state);
-	mutex_unlock(&state->lock);
 	if (ret)
 		return ret;
 
@@ -215,9 +218,9 @@ static ssize_t cleaning_period_show(struct device *dev,
 	__be32 val;
 	int ret;
 
-	mutex_lock(&state->lock);
+	guard(mutex)(&state->lock);
+
 	ret = state->ops->read_cleaning_period(state, &val);
-	mutex_unlock(&state->lock);
 	if (ret)
 		return ret;
 
@@ -238,12 +241,11 @@ static ssize_t cleaning_period_store(struct device *dev, struct device_attribute
 	    (val > SPS30_AUTO_CLEANING_PERIOD_MAX))
 		return -EINVAL;
 
-	mutex_lock(&state->lock);
+	guard(mutex)(&state->lock);
+
 	ret = state->ops->write_cleaning_period(state, cpu_to_be32(val));
-	if (ret) {
-		mutex_unlock(&state->lock);
+	if (ret)
 		return ret;
-	}
 
 	msleep(20);
 
@@ -256,8 +258,6 @@ static ssize_t cleaning_period_store(struct device *dev, struct device_attribute
 		dev_warn(dev,
 			 "period changed but reads will return the old value\n");
 
-	mutex_unlock(&state->lock);
-
 	return len;
 }
 
-- 
2.54.0