netdev - [PATCH net-next 04/54] net: ethernet: allwinner: Convert to platform remove callback returning void

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Date: Mon, 18 Sep 2023 22:41:36 +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: Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	kernel@...gutronix.de
Subject: [PATCH net-next 04/54] net: ethernet: allwinner: 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/ethernet/allwinner/sun4i-emac.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index a94c62956eed..d761c08fe5c1 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -1083,7 +1083,7 @@ static int emac_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int emac_remove(struct platform_device *pdev)
+static void emac_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct emac_board_info *db = netdev_priv(ndev);
@@ -1101,7 +1101,6 @@ static int emac_remove(struct platform_device *pdev)
 	free_netdev(ndev);
 
 	dev_dbg(&pdev->dev, "released and freed device\n");
-	return 0;
 }
 
 static int emac_suspend(struct platform_device *dev, pm_message_t state)
@@ -1143,7 +1142,7 @@ static struct platform_driver emac_driver = {
 		.of_match_table = emac_of_match,
 	},
 	.probe = emac_probe,
-	.remove = emac_remove,
+	.remove_new = emac_remove,
 	.suspend = emac_suspend,
 	.resume = emac_resume,
 };
-- 
2.40.1