netdev - [PATCH 17/19] can: sun4i_can: Convert to platform remove callback returning void

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Message-Id: <20230512212725.143824-18-u.kleine-koenig@pengutronix.de>
Date: Fri, 12 May 2023 23:27:23 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Wolfgang Grandegger <wg@...ndegger.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>
Cc: linux-can@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	kernel@...gutronix.de
Subject: [PATCH 17/19] can: sun4i_can: 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/can/sun4i_can.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index 2b78f9197681..0827830bbf28 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -791,14 +791,12 @@ static const struct of_device_id sun4ican_of_match[] = {
 
 MODULE_DEVICE_TABLE(of, sun4ican_of_match);
 
-static int sun4ican_remove(struct platform_device *pdev)
+static void sun4ican_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 
 	unregister_netdev(dev);
 	free_candev(dev);
-
-	return 0;
 }
 
 static int sun4ican_probe(struct platform_device *pdev)
@@ -901,7 +899,7 @@ static struct platform_driver sun4i_can_driver = {
 		.of_match_table = sun4ican_of_match,
 	},
 	.probe = sun4ican_probe,
-	.remove = sun4ican_remove,
+	.remove_new = sun4ican_remove,
 };
 
 module_platform_driver(sun4i_can_driver);
-- 
2.39.2