netdev - [PATCH 05/19] can: cc770_platform: Convert to platform remove callback returning void

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Message-Id: <20230512212725.143824-6-u.kleine-koenig@pengutronix.de>
Date: Fri, 12 May 2023 23:27:11 +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>,
	Wei Fang <wei.fang@....com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Rob Herring <robh@...nel.org>
Cc: linux-can@...r.kernel.org,
	netdev@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 05/19] can: cc770_platform: 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/cc770/cc770_platform.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/cc770/cc770_platform.c b/drivers/net/can/cc770/cc770_platform.c
index 8dcc32e4e30e..13bcfba05f18 100644
--- a/drivers/net/can/cc770/cc770_platform.c
+++ b/drivers/net/can/cc770/cc770_platform.c
@@ -230,7 +230,7 @@ static int cc770_platform_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int cc770_platform_remove(struct platform_device *pdev)
+static void cc770_platform_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 	struct cc770_priv *priv = netdev_priv(dev);
@@ -242,8 +242,6 @@ static int cc770_platform_remove(struct platform_device *pdev)
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(mem->start, resource_size(mem));
-
-	return 0;
 }
 
 static const struct of_device_id cc770_platform_table[] = {
@@ -259,7 +257,7 @@ static struct platform_driver cc770_platform_driver = {
 		.of_match_table = cc770_platform_table,
 	},
 	.probe = cc770_platform_probe,
-	.remove = cc770_platform_remove,
+	.remove_new = cc770_platform_remove,
 };
 
 module_platform_driver(cc770_platform_driver);
-- 
2.39.2