netdev - [PATCH net-next 09/22] can: ctucanfd: Convert to platform remove callback returning void

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Message-Id: <20230515205759.1003118-10-mkl@pengutronix.de>
Date: Mon, 15 May 2023 22:57:46 +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>,
	Pavel Pisa <pisa@....felk.cvut.cz>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 09/22] can: ctucanfd: 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>
Acked-by: Pavel Pisa <pisa@....felk.cvut.cz>
Link: https://lore.kernel.org/r/20230512212725.143824-7-u.kleine-koenig@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/ctucanfd/ctucanfd_platform.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/ctucanfd/ctucanfd_platform.c b/drivers/net/can/ctucanfd/ctucanfd_platform.c
index a17561d97192..55bb10b157b4 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_platform.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_platform.c
@@ -86,7 +86,7 @@ static int ctucan_platform_probe(struct platform_device *pdev)
  * This function frees all the resources allocated to the device.
  * Return: 0 always
  */
-static int ctucan_platform_remove(struct platform_device *pdev)
+static void ctucan_platform_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct ctucan_priv *priv = netdev_priv(ndev);
@@ -97,8 +97,6 @@ static int ctucan_platform_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 	netif_napi_del(&priv->napi);
 	free_candev(ndev);
-
-	return 0;
 }
 
 static SIMPLE_DEV_PM_OPS(ctucan_platform_pm_ops, ctucan_suspend, ctucan_resume);
@@ -113,7 +111,7 @@ MODULE_DEVICE_TABLE(of, ctucan_of_match);
 
 static struct platform_driver ctucanfd_driver = {
 	.probe	= ctucan_platform_probe,
-	.remove	= ctucan_platform_remove,
+	.remove_new = ctucan_platform_remove,
 	.driver	= {
 		.name = DRV_NAME,
 		.pm = &ctucan_platform_pm_ops,
-- 
2.39.2