linux-kernel - [PATCH] gpio: ljca: use devm_mutex_init() to simplify the error path and remove()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241008162416.85111-1-brgl@bgdev.pl>
Date: Tue,  8 Oct 2024 18:24:16 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] gpio: ljca: use devm_mutex_init() to simplify the error path and remove()

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Destroying the mutexes is done at the end of remove() so switching to
devres does not constitute a functional change. Use devm_mutex_init()
and remove repetitions of mutex_destroy().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-ljca.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-ljca.c b/drivers/gpio/gpio-ljca.c
index dfec9fbfc7a9..d67b912d884d 100644
--- a/drivers/gpio/gpio-ljca.c
+++ b/drivers/gpio/gpio-ljca.c
@@ -420,8 +420,14 @@ static int ljca_gpio_probe(struct auxiliary_device *auxdev,
 	if (!ljca_gpio->connect_mode)
 		return -ENOMEM;
 
-	mutex_init(&ljca_gpio->irq_lock);
-	mutex_init(&ljca_gpio->trans_lock);
+	ret = devm_mutex_init(&auxdev->dev, &ljca_gpio->irq_lock);
+	if (ret)
+		return ret;
+
+	ret = devm_mutex_init(&auxdev->dev, &ljca_gpio->trans_lock);
+	if (ret)
+		return ret;
+
 	ljca_gpio->gc.direction_input = ljca_gpio_direction_input;
 	ljca_gpio->gc.direction_output = ljca_gpio_direction_output;
 	ljca_gpio->gc.get_direction = ljca_gpio_get_direction;
@@ -453,11 +459,8 @@ static int ljca_gpio_probe(struct auxiliary_device *auxdev,
 
 	INIT_WORK(&ljca_gpio->work, ljca_gpio_async);
 	ret = gpiochip_add_data(&ljca_gpio->gc, ljca_gpio);
-	if (ret) {
+	if (ret)
 		ljca_unregister_event_cb(ljca);
-		mutex_destroy(&ljca_gpio->irq_lock);
-		mutex_destroy(&ljca_gpio->trans_lock);
-	}
 
 	return ret;
 }
@@ -469,8 +472,6 @@ static void ljca_gpio_remove(struct auxiliary_device *auxdev)
 	gpiochip_remove(&ljca_gpio->gc);
 	ljca_unregister_event_cb(ljca_gpio->ljca);
 	cancel_work_sync(&ljca_gpio->work);
-	mutex_destroy(&ljca_gpio->irq_lock);
-	mutex_destroy(&ljca_gpio->trans_lock);
 }
 
 static const struct auxiliary_device_id ljca_gpio_id_table[] = {
-- 
2.43.0