linux-kernel - [PATCH 08/23] gpio: ljca: Convert to platform remove callback returning void

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Message-Id: <20230928070706.2290137-9-u.kleine-koenig@pengutronix.de>
Date:   Thu, 28 Sep 2023 09:06:51 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andy@...nel.org>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 08/23] gpio: ljca: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/gpio/gpio-ljca.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-ljca.c b/drivers/gpio/gpio-ljca.c
index 87863f0230f5..aca69329455f 100644
--- a/drivers/gpio/gpio-ljca.c
+++ b/drivers/gpio/gpio-ljca.c
@@ -421,7 +421,7 @@ static int ljca_gpio_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int ljca_gpio_remove(struct platform_device *pdev)
+static void ljca_gpio_remove(struct platform_device *pdev)
 {
 	struct ljca_gpio_dev *ljca_gpio = platform_get_drvdata(pdev);
 
@@ -429,7 +429,6 @@ static int ljca_gpio_remove(struct platform_device *pdev)
 	ljca_unregister_event_cb(ljca_gpio->gpio_info->ljca);
 	mutex_destroy(&ljca_gpio->irq_lock);
 	mutex_destroy(&ljca_gpio->trans_lock);
-	return 0;
 }
 
 #define LJCA_GPIO_DRV_NAME "ljca-gpio"
@@ -442,7 +441,7 @@ MODULE_DEVICE_TABLE(platform, ljca_gpio_id);
 static struct platform_driver ljca_gpio_driver = {
 	.driver.name = LJCA_GPIO_DRV_NAME,
 	.probe = ljca_gpio_probe,
-	.remove = ljca_gpio_remove,
+	.remove_new = ljca_gpio_remove,
 };
 module_platform_driver(ljca_gpio_driver);
 
-- 
2.40.1