netdev - [PATCH net-next 6/9] net: dsa: ocelot: Convert to platform remove callback returning void

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Date: Mon, 18 Sep 2023 21:19:13 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Colin Foster <colin.foster@...advantage.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	UNGLinuxDriver@...rochip.com,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH net-next 6/9] net: dsa: ocelot: 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 these drivers 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/dsa/ocelot/ocelot_ext.c      | 8 +++-----
 drivers/net/dsa/ocelot/seville_vsc9953.c | 8 +++-----
 2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/net/dsa/ocelot/ocelot_ext.c b/drivers/net/dsa/ocelot/ocelot_ext.c
index c29bee5a5c48..22187d831c4b 100644
--- a/drivers/net/dsa/ocelot/ocelot_ext.c
+++ b/drivers/net/dsa/ocelot/ocelot_ext.c
@@ -115,19 +115,17 @@ static int ocelot_ext_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int ocelot_ext_remove(struct platform_device *pdev)
+static void ocelot_ext_remove(struct platform_device *pdev)
 {
 	struct felix *felix = dev_get_drvdata(&pdev->dev);
 
 	if (!felix)
-		return 0;
+		return;
 
 	dsa_unregister_switch(felix->ds);
 
 	kfree(felix->ds);
 	kfree(felix);
-
-	return 0;
 }
 
 static void ocelot_ext_shutdown(struct platform_device *pdev)
@@ -154,7 +152,7 @@ static struct platform_driver ocelot_ext_switch_driver = {
 		.of_match_table = ocelot_ext_switch_of_match,
 	},
 	.probe = ocelot_ext_probe,
-	.remove = ocelot_ext_remove,
+	.remove_new = ocelot_ext_remove,
 	.shutdown = ocelot_ext_shutdown,
 };
 module_platform_driver(ocelot_ext_switch_driver);
diff --git a/drivers/net/dsa/ocelot/seville_vsc9953.c b/drivers/net/dsa/ocelot/seville_vsc9953.c
index 8f912bda120b..049930da0521 100644
--- a/drivers/net/dsa/ocelot/seville_vsc9953.c
+++ b/drivers/net/dsa/ocelot/seville_vsc9953.c
@@ -1029,19 +1029,17 @@ static int seville_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int seville_remove(struct platform_device *pdev)
+static void seville_remove(struct platform_device *pdev)
 {
 	struct felix *felix = platform_get_drvdata(pdev);
 
 	if (!felix)
-		return 0;
+		return;
 
 	dsa_unregister_switch(felix->ds);
 
 	kfree(felix->ds);
 	kfree(felix);
-
-	return 0;
 }
 
 static void seville_shutdown(struct platform_device *pdev)
@@ -1064,7 +1062,7 @@ MODULE_DEVICE_TABLE(of, seville_of_match);
 
 static struct platform_driver seville_vsc9953_driver = {
 	.probe		= seville_probe,
-	.remove		= seville_remove,
+	.remove_new	= seville_remove,
 	.shutdown	= seville_shutdown,
 	.driver = {
 		.name		= "mscc_seville",
-- 
2.40.1