linux-kernel - [PATCH 8/8] iio: adc: adi-axi-adc: Use __free(device

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Date: Sun, 11 Feb 2024 17:42:36 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: linux-iio@...r.kernel.org,
	Rob Herring <robh@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	linux-kernel@...r.kernel.org,
	Julia Lawall <Julia.Lawall@...ia.fr>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Sumera Priyadarsini <sylphrenadin@...il.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nuno Sá <nuno.sa@...log.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 8/8] iio: adc: adi-axi-adc: Use __free(device_node) and guard(mutex)

From: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Avoid need to manually handle of_node_put() or the unlocking of the
mutex.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/iio/adc/adi-axi-adc.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index c247ff1541d2..3c85e8a6467b 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -248,19 +248,19 @@ static struct adi_axi_adc_client *adi_axi_adc_attach_client(struct device *dev)
 {
 	const struct adi_axi_adc_core_info *info;
 	struct adi_axi_adc_client *cl;
-	struct device_node *cln;
 
 	info = of_device_get_match_data(dev);
 	if (!info)
 		return ERR_PTR(-ENODEV);
 
-	cln = of_parse_phandle(dev->of_node, "adi,adc-dev", 0);
+	struct device_node *cln __free(device_node) =
+		of_parse_phandle(dev->of_node, "adi,adc-dev", 0);
 	if (!cln) {
 		dev_err(dev, "No 'adi,adc-dev' node defined\n");
 		return ERR_PTR(-ENODEV);
 	}
 
-	mutex_lock(&registered_clients_lock);
+	guard(mutex)(&registered_clients_lock);
 
 	list_for_each_entry(cl, &registered_clients, entry) {
 		if (!cl->dev)
@@ -269,22 +269,14 @@ static struct adi_axi_adc_client *adi_axi_adc_attach_client(struct device *dev)
 		if (cl->dev->of_node != cln)
 			continue;
 
-		if (!try_module_get(cl->dev->driver->owner)) {
-			mutex_unlock(&registered_clients_lock);
-			of_node_put(cln);
+		if (!try_module_get(cl->dev->driver->owner))
 			return ERR_PTR(-ENODEV);
-		}
 
 		get_device(cl->dev);
 		cl->info = info;
-		mutex_unlock(&registered_clients_lock);
-		of_node_put(cln);
 		return cl;
 	}
 
-	mutex_unlock(&registered_clients_lock);
-	of_node_put(cln);
-
 	return ERR_PTR(-EPROBE_DEFER);
 }
 
-- 
2.43.1