linux-kernel - [PATCH net-next 04/19] net: mdio: gpio: Convert to platform remove callback returning void

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Message-Id: <20230918195102.1302746-5-u.kleine-koenig@pengutronix.de>
Date:   Mon, 18 Sep 2023 21:50:47 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 04/19] net: mdio: gpio: 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() is 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/net/mdio/mdio-gpio.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mdio/mdio-gpio.c b/drivers/net/mdio/mdio-gpio.c
index 0fb3c2de0845..897b88c50bbb 100644
--- a/drivers/net/mdio/mdio-gpio.c
+++ b/drivers/net/mdio/mdio-gpio.c
@@ -194,11 +194,9 @@ static int mdio_gpio_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mdio_gpio_remove(struct platform_device *pdev)
+static void mdio_gpio_remove(struct platform_device *pdev)
 {
 	mdio_gpio_bus_destroy(&pdev->dev);
-
-	return 0;
 }
 
 static const struct of_device_id mdio_gpio_of_match[] = {
@@ -210,7 +208,7 @@ MODULE_DEVICE_TABLE(of, mdio_gpio_of_match);
 
 static struct platform_driver mdio_gpio_driver = {
 	.probe = mdio_gpio_probe,
-	.remove = mdio_gpio_remove,
+	.remove_new = mdio_gpio_remove,
 	.driver		= {
 		.name	= "mdio-gpio",
 		.of_match_table = mdio_gpio_of_match,
-- 
2.40.1