netdev - [PATCH net-next 13/22] can: janz-ican3: Convert to platform remove callback returning void

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Message-Id: <20230515205759.1003118-14-mkl@pengutronix.de>
Date: Mon, 15 May 2023 22:57:50 +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 13/22] can: janz-ican3: 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/20230512212725.143824-11-u.kleine-koenig@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/janz-ican3.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 0732a5092141..d048ea565b89 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -2023,7 +2023,7 @@ static int ican3_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int ican3_remove(struct platform_device *pdev)
+static void ican3_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct ican3_dev *mod = netdev_priv(ndev);
@@ -2042,8 +2042,6 @@ static int ican3_remove(struct platform_device *pdev)
 	iounmap(mod->dpm);
 
 	free_candev(ndev);
-
-	return 0;
 }
 
 static struct platform_driver ican3_driver = {
@@ -2051,7 +2049,7 @@ static struct platform_driver ican3_driver = {
 		.name	= DRV_NAME,
 	},
 	.probe		= ican3_probe,
-	.remove		= ican3_remove,
+	.remove_new	= ican3_remove,
 };
 
 module_platform_driver(ican3_driver);
-- 
2.39.2