linux-kernel - [PATCH 3/5] reset: simplify locking with guard()

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Message-Id: <20240825-reset-cleanup-scoped-v1-3-03f6d834f8c0@linaro.org>
Date: Sun, 25 Aug 2024 16:14:26 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Philipp Zabel <p.zabel@...gutronix.de>, 
 Antoine Tenart <atenart@...nel.org>, 
 Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>, 
 Damien Le Moal <dlemoal@...nel.org>, 
 Palmer Dabbelt <palmerdabbelt@...gle.com>, 
 Vladimir Zapolskiy <vz@...ia.com>
Cc: linux-kernel@...r.kernel.org, Damien Le Moal <damien.lemoal@....com>, 
 linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 3/5] reset: simplify locking with guard()

Simplify error handling (less gotos) over locks with guard().

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/reset/core.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index dba74e857be6..c9074810306c 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -916,20 +916,18 @@ static int __reset_add_reset_gpio_device(const struct of_phandle_args *args)
 	 */
 	lockdep_assert_not_held(&reset_list_mutex);
 
-	mutex_lock(&reset_gpio_lookup_mutex);
+	guard(mutex)(&reset_gpio_lookup_mutex);
 
 	list_for_each_entry(rgpio_dev, &reset_gpio_lookup_list, list) {
 		if (args->np == rgpio_dev->of_args.np) {
 			if (of_phandle_args_equal(args, &rgpio_dev->of_args))
-				goto out; /* Already on the list, done */
+				return 0; /* Already on the list, done */
 		}
 	}
 
 	id = ida_alloc(&reset_gpio_ida, GFP_KERNEL);
-	if (id < 0) {
-		ret = id;
-		goto err_unlock;
-	}
+	if (id < 0)
+		return id;
 
 	/* Not freed on success, because it is persisent subsystem data. */
 	rgpio_dev = kzalloc(sizeof(*rgpio_dev), GFP_KERNEL);
@@ -959,9 +957,6 @@ static int __reset_add_reset_gpio_device(const struct of_phandle_args *args)
 
 	list_add(&rgpio_dev->list, &reset_gpio_lookup_list);
 
-out:
-	mutex_unlock(&reset_gpio_lookup_mutex);
-
 	return 0;
 
 err_put:
@@ -970,8 +965,6 @@ static int __reset_add_reset_gpio_device(const struct of_phandle_args *args)
 	kfree(rgpio_dev);
 err_ida_free:
 	ida_free(&reset_gpio_ida, id);
-err_unlock:
-	mutex_unlock(&reset_gpio_lookup_mutex);
 
 	return ret;
 }

-- 
2.43.0