netdev - [PATCH net-next 1/9] net: dsa: b53: Convert to platform remove callback returning void

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Message-Id: <20230918191916.1299418-2-u.kleine-koenig@pengutronix.de>
Date: Mon, 18 Sep 2023 21:19:08 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Florian Fainelli <florian.fainelli@...adcom.com>,
	Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...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 1/9] net: dsa: b53: 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/b53/b53_mmap.c | 6 ++----
 drivers/net/dsa/b53/b53_srab.c | 8 +++-----
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
index 5e39641ea887..3a89349dc918 100644
--- a/drivers/net/dsa/b53/b53_mmap.c
+++ b/drivers/net/dsa/b53/b53_mmap.c
@@ -324,14 +324,12 @@ static int b53_mmap_probe(struct platform_device *pdev)
 	return b53_switch_register(dev);
 }
 
-static int b53_mmap_remove(struct platform_device *pdev)
+static void b53_mmap_remove(struct platform_device *pdev)
 {
 	struct b53_device *dev = platform_get_drvdata(pdev);
 
 	if (dev)
 		b53_switch_remove(dev);
-
-	return 0;
 }
 
 static void b53_mmap_shutdown(struct platform_device *pdev)
@@ -372,7 +370,7 @@ MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
 
 static struct platform_driver b53_mmap_driver = {
 	.probe = b53_mmap_probe,
-	.remove = b53_mmap_remove,
+	.remove_new = b53_mmap_remove,
 	.shutdown = b53_mmap_shutdown,
 	.driver = {
 		.name = "b53-switch",
diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
index bcb44034404d..f3f95332ff17 100644
--- a/drivers/net/dsa/b53/b53_srab.c
+++ b/drivers/net/dsa/b53/b53_srab.c
@@ -657,17 +657,15 @@ static int b53_srab_probe(struct platform_device *pdev)
 	return b53_switch_register(dev);
 }
 
-static int b53_srab_remove(struct platform_device *pdev)
+static void b53_srab_remove(struct platform_device *pdev)
 {
 	struct b53_device *dev = platform_get_drvdata(pdev);
 
 	if (!dev)
-		return 0;
+		return;
 
 	b53_srab_intr_set(dev->priv, false);
 	b53_switch_remove(dev);
-
-	return 0;
 }
 
 static void b53_srab_shutdown(struct platform_device *pdev)
@@ -684,7 +682,7 @@ static void b53_srab_shutdown(struct platform_device *pdev)
 
 static struct platform_driver b53_srab_driver = {
 	.probe = b53_srab_probe,
-	.remove = b53_srab_remove,
+	.remove_new = b53_srab_remove,
 	.shutdown = b53_srab_shutdown,
 	.driver = {
 		.name = "b53-srab-switch",
-- 
2.40.1