linux-kernel - [PATCH 05/23] gpio: dln2: Convert to platform remove callback returning void

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Message-Id: <20230928070706.2290137-6-u.kleine-koenig@pengutronix.de>
Date:   Thu, 28 Sep 2023 09:06:48 +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 05/23] gpio: dln2: 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-dln2.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpio-dln2.c b/drivers/gpio/gpio-dln2.c
index 71fa437b491f..7ead1f51128a 100644
--- a/drivers/gpio/gpio-dln2.c
+++ b/drivers/gpio/gpio-dln2.c
@@ -504,17 +504,15 @@ static int dln2_gpio_probe(struct platform_device *pdev)
 	return 0;
 }

-static int dln2_gpio_remove(struct platform_device *pdev)
+static void dln2_gpio_remove(struct platform_device *pdev)
 {
 	dln2_unregister_event_cb(pdev, DLN2_GPIO_CONDITION_MET_EV);
-
-	return 0;
 }

 static struct platform_driver dln2_gpio_driver = {
 	.driver.name	= "dln2-gpio",
 	.probe		= dln2_gpio_probe,
-	.remove		= dln2_gpio_remove,
+	.remove_new	= dln2_gpio_remove,
 };

 module_platform_driver(dln2_gpio_driver);
-- 
2.40.1