netdev - [PATCH net-next 12/22] can: ifi_canfd: Convert to platform remove callback returning void

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Message-Id: <20230515205759.1003118-13-mkl@pengutronix.de>
Date: Mon, 15 May 2023 22:57:49 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 12/22] can: ifi_canfd: Convert to platform remove callback returning void

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

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>
Link: https://lore.kernel.org/r/20230512212725.143824-10-u.kleine-koenig@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/ifi_canfd/ifi_canfd.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/ifi_canfd/ifi_canfd.c b/drivers/net/can/ifi_canfd/ifi_canfd.c
index 07eaf724a572..1d6642c94f2f 100644
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -1013,15 +1013,13 @@ static int ifi_canfd_plat_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int ifi_canfd_plat_remove(struct platform_device *pdev)
+static void ifi_canfd_plat_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 
 	unregister_candev(ndev);
 	platform_set_drvdata(pdev, NULL);
 	free_candev(ndev);
-
-	return 0;
 }
 
 static const struct of_device_id ifi_canfd_of_table[] = {
@@ -1036,7 +1034,7 @@ static struct platform_driver ifi_canfd_plat_driver = {
 		.of_match_table	= ifi_canfd_of_table,
 	},
 	.probe	= ifi_canfd_plat_probe,
-	.remove	= ifi_canfd_plat_remove,
+	.remove_new = ifi_canfd_plat_remove,
 };
 
 module_platform_driver(ifi_canfd_plat_driver);
-- 
2.39.2