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Message-ID: <93a9d7ab74cd045949a2e2b6301f29c7d83d72ea.1742474322.git.mazziesaccount@gmail.com>
Date: Mon, 31 Mar 2025 11:03:44 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Matti Vaittinen <mazziesaccount@...il.com>,
Nuno Sa <nuno.sa@...log.com>, David Lechner <dlechner@...libre.com>,
Javier Carrasco <javier.carrasco.cruz@...il.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] iio: adc: ti-adc128s052: Simplify using guard(mutex)
Error path in ADC reading function can be slighly simplified using the
guard(mutex). Do just that.
Also, document the mutex purpose while at it.
Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
drivers/iio/adc/ti-adc128s052.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
index 90b23c68daea..c68ee4e17a03 100644
--- a/drivers/iio/adc/ti-adc128s052.c
+++ b/drivers/iio/adc/ti-adc128s052.c
@@ -9,6 +9,7 @@
* https://www.ti.com/lit/ds/symlink/adc124s021.pdf
*/
+#include <linux/cleanup.h>
#include <linux/err.h>
#include <linux/iio/iio.h>
#include <linux/mod_devicetable.h>
@@ -26,6 +27,7 @@ struct adc128 {
struct spi_device *spi;
struct regulator *reg;
+ /* Serialize the SPI 'write-channel + read data' accesses */
struct mutex lock;
__be16 buffer __aligned(IIO_DMA_MINALIGN);
@@ -39,18 +41,13 @@ static int adc128_adc_conversion(struct adc128 *adc, u8 channel)
msg[0] = channel << 3;
msg[1] = 0;
- mutex_lock(&adc->lock);
+ guard(mutex)(&adc->lock);
ret = spi_write(adc->spi, msg, 2);
- if (ret < 0) {
- mutex_unlock(&adc->lock);
+ if (ret < 0)
return ret;
- }
ret = spi_read(adc->spi, &adc->buffer, 2);
-
- mutex_unlock(&adc->lock);
-
if (ret < 0)
return ret;
--
2.48.1
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