netdev - [PATCH net-next v3 5/8] net: fs_enet: Convert to platform remove callback returning void

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Date: Mon, 10 Jul 2023 09:19:43 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Pantelis Antoniou <pantelis.antoniou@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <simon.horman@...igine.com>,
	linuxppc-dev@...ts.ozlabs.org,
	netdev@...r.kernel.org,
	kernel@...gutronix.de,
	Michal Kubiak <michal.kubiak@...el.com>
Subject: [PATCH net-next v3 5/8] net: fs_enet: 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 (mostly) ignored
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.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Reviewed-by: Michal Kubiak <michal.kubiak@...el.com>
Reviewed-by: Simon Horman <simon.horman@...igine.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c | 5 ++---
 drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c  | 6 ++----
 drivers/net/ethernet/freescale/fs_enet/mii-fec.c      | 6 ++----
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
index 8844a9a04fcf..f9f5b28cc72e 100644
--- a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
+++ b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
@@ -1051,7 +1051,7 @@ static int fs_enet_probe(struct platform_device *ofdev)
 	return ret;
 }
 
-static int fs_enet_remove(struct platform_device *ofdev)
+static void fs_enet_remove(struct platform_device *ofdev)
 {
 	struct net_device *ndev = platform_get_drvdata(ofdev);
 	struct fs_enet_private *fep = netdev_priv(ndev);
@@ -1066,7 +1066,6 @@ static int fs_enet_remove(struct platform_device *ofdev)
 	if (of_phy_is_fixed_link(ofdev->dev.of_node))
 		of_phy_deregister_fixed_link(ofdev->dev.of_node);
 	free_netdev(ndev);
-	return 0;
 }
 
 static const struct of_device_id fs_enet_match[] = {
@@ -1113,7 +1112,7 @@ static struct platform_driver fs_enet_driver = {
 		.of_match_table = fs_enet_match,
 	},
 	.probe = fs_enet_probe,
-	.remove = fs_enet_remove,
+	.remove_new = fs_enet_remove,
 };
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
diff --git a/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c b/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c
index 21de56345503..91a69fc2f7c2 100644
--- a/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c
+++ b/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c
@@ -192,7 +192,7 @@ static int fs_enet_mdio_probe(struct platform_device *ofdev)
 	return ret;
 }
 
-static int fs_enet_mdio_remove(struct platform_device *ofdev)
+static void fs_enet_mdio_remove(struct platform_device *ofdev)
 {
 	struct mii_bus *bus = platform_get_drvdata(ofdev);
 	struct bb_info *bitbang = bus->priv;
@@ -201,8 +201,6 @@ static int fs_enet_mdio_remove(struct platform_device *ofdev)
 	free_mdio_bitbang(bus);
 	iounmap(bitbang->dir);
 	kfree(bitbang);
-
-	return 0;
 }
 
 static const struct of_device_id fs_enet_mdio_bb_match[] = {
@@ -219,7 +217,7 @@ static struct platform_driver fs_enet_bb_mdio_driver = {
 		.of_match_table = fs_enet_mdio_bb_match,
 	},
 	.probe = fs_enet_mdio_probe,
-	.remove = fs_enet_mdio_remove,
+	.remove_new = fs_enet_mdio_remove,
 };
 
 module_platform_driver(fs_enet_bb_mdio_driver);
diff --git a/drivers/net/ethernet/freescale/fs_enet/mii-fec.c b/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
index 59a8f0bd0f5c..1910df250c33 100644
--- a/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
+++ b/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
@@ -187,7 +187,7 @@ static int fs_enet_mdio_probe(struct platform_device *ofdev)
 	return ret;
 }
 
-static int fs_enet_mdio_remove(struct platform_device *ofdev)
+static void fs_enet_mdio_remove(struct platform_device *ofdev)
 {
 	struct mii_bus *bus = platform_get_drvdata(ofdev);
 	struct fec_info *fec = bus->priv;
@@ -196,8 +196,6 @@ static int fs_enet_mdio_remove(struct platform_device *ofdev)
 	iounmap(fec->fecp);
 	kfree(fec);
 	mdiobus_free(bus);
-
-	return 0;
 }
 
 static const struct of_device_id fs_enet_mdio_fec_match[] = {
@@ -220,7 +218,7 @@ static struct platform_driver fs_enet_fec_mdio_driver = {
 		.of_match_table = fs_enet_mdio_fec_match,
 	},
 	.probe = fs_enet_mdio_probe,
-	.remove = fs_enet_mdio_remove,
+	.remove_new = fs_enet_mdio_remove,
 };
 
 module_platform_driver(fs_enet_fec_mdio_driver);
-- 
2.39.2