linux-kernel - [PATCH] iio: adc: mcp3911: simplify code with guard macro

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Message-Id: <20231125-mcp3911-guard-v1-1-2748d16a3f3f@gmail.com>
Date:   Sat, 25 Nov 2023 19:57:24 +0100
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Kent Gustavsson <kent@...oris.se>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH] iio: adc: mcp3911: simplify code with guard macro

Use the guard(mutex) macro for handle mutex lock/unlocks.

Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
 drivers/iio/adc/mcp3911.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index 974c5bd923a6..85bb13eb6f3b 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -7,6 +7,7 @@
  */
 #include <linux/bitfield.h>
 #include <linux/bits.h>
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/err.h>
@@ -168,7 +169,7 @@ static int mcp3911_read_raw(struct iio_dev *indio_dev,
 	struct mcp3911 *adc = iio_priv(indio_dev);
 	int ret = -EINVAL;
 
-	mutex_lock(&adc->lock);
+	guard(mutex)(&adc->lock);
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		ret = mcp3911_read(adc,
@@ -207,7 +208,6 @@ static int mcp3911_read_raw(struct iio_dev *indio_dev,
 	}
 
 out:
-	mutex_unlock(&adc->lock);
 	return ret;
 }
 
@@ -218,7 +218,7 @@ static int mcp3911_write_raw(struct iio_dev *indio_dev,
 	struct mcp3911 *adc = iio_priv(indio_dev);
 	int ret = -EINVAL;
 
-	mutex_lock(&adc->lock);
+	guard(mutex)(&adc->lock);
 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
 		for (int i = 0; i < MCP3911_NUM_SCALES; i++) {
@@ -263,7 +263,6 @@ static int mcp3911_write_raw(struct iio_dev *indio_dev,
 	}
 
 out:
-	mutex_unlock(&adc->lock);
 	return ret;
 }
 
@@ -350,7 +349,7 @@ static irqreturn_t mcp3911_trigger_handler(int irq, void *p)
 	int i = 0;
 	int ret;
 
-	mutex_lock(&adc->lock);
+	guard(mutex)(&adc->lock);
 	adc->tx_buf = MCP3911_REG_READ(MCP3911_CHANNEL(0), adc->dev_addr);
 	ret = spi_sync_transfer(adc->spi, xfer, ARRAY_SIZE(xfer));
 	if (ret < 0) {
@@ -368,7 +367,6 @@ static irqreturn_t mcp3911_trigger_handler(int irq, void *p)
 	iio_push_to_buffers_with_timestamp(indio_dev, &adc->scan,
 					   iio_get_time_ns(indio_dev));
 out:
-	mutex_unlock(&adc->lock);
 	iio_trigger_notify_done(indio_dev->trig);
 
 	return IRQ_HANDLED;

---
base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa
change-id: 20231125-mcp3911-guard-866591e2c947

Best regards,
-- 
Marcus Folkesson <marcus.folkesson@...il.com>