netdev - [PATCH net-next 44/54] net: ethernet: sgi: Convert to platform remove callback returning void

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Date: Mon, 18 Sep 2023 22:42:16 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>,
	linux-mips@...r.kernel.org,
	netdev@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH net-next 44/54] net: ethernet: sgi: 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/ethernet/sgi/ioc3-eth.c | 6 ++----
 drivers/net/ethernet/sgi/meth.c     | 6 ++----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index 8fc3f5272fa7..98d0b561a057 100644
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -962,7 +962,7 @@ static int ioc3eth_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int ioc3eth_remove(struct platform_device *pdev)
+static void ioc3eth_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 	struct ioc3_private *ip = netdev_priv(dev);
@@ -973,8 +973,6 @@ static int ioc3eth_remove(struct platform_device *pdev)
 	unregister_netdev(dev);
 	del_timer_sync(&ip->ioc3_timer);
 	free_netdev(dev);
-
-	return 0;
 }
 
 
@@ -1275,7 +1273,7 @@ static void ioc3_set_multicast_list(struct net_device *dev)
 
 static struct platform_driver ioc3eth_driver = {
 	.probe  = ioc3eth_probe,
-	.remove = ioc3eth_remove,
+	.remove_new = ioc3eth_remove,
 	.driver = {
 		.name = "ioc3-eth",
 	}
diff --git a/drivers/net/ethernet/sgi/meth.c b/drivers/net/ethernet/sgi/meth.c
index 6d850ea2b94c..18b6f93d875e 100644
--- a/drivers/net/ethernet/sgi/meth.c
+++ b/drivers/net/ethernet/sgi/meth.c
@@ -854,19 +854,17 @@ static int meth_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int meth_remove(struct platform_device *pdev)
+static void meth_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 
 	unregister_netdev(dev);
 	free_netdev(dev);
-
-	return 0;
 }
 
 static struct platform_driver meth_driver = {
 	.probe	= meth_probe,
-	.remove	= meth_remove,
+	.remove_new = meth_remove,
 	.driver = {
 		.name	= "meth",
 	}
-- 
2.40.1