netdev - [PATCH net-next 17/54] net: ethernet: davicom: Convert to platform remove callback returning void

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Date: Mon, 18 Sep 2023 22:41:49 +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: Wei Fang <wei.fang@....com>,
	Simon Horman <horms@...nel.org>,
	Kalle Valo <kvalo@...nel.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Nathan Huckleberry <nhuck@...gle.com>,
	Rob Herring <robh@...nel.org>,
	netdev@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH net-next 17/54] net: ethernet: davicom: 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/davicom/dm9000.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
index 05a89ab6766c..150cc94ae9f8 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -1770,8 +1770,7 @@ static const struct dev_pm_ops dm9000_drv_pm_ops = {
 	.resume		= dm9000_drv_resume,
 };
 
-static int
-dm9000_drv_remove(struct platform_device *pdev)
+static void dm9000_drv_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct board_info *dm = to_dm9000_board(ndev);
@@ -1783,7 +1782,6 @@ dm9000_drv_remove(struct platform_device *pdev)
 		regulator_disable(dm->power_supply);
 
 	dev_dbg(&pdev->dev, "released and freed device\n");
-	return 0;
 }
 
 #ifdef CONFIG_OF
@@ -1801,7 +1799,7 @@ static struct platform_driver dm9000_driver = {
 		.of_match_table = of_match_ptr(dm9000_of_matches),
 	},
 	.probe   = dm9000_probe,
-	.remove  = dm9000_drv_remove,
+	.remove_new = dm9000_drv_remove,
 };
 
 module_platform_driver(dm9000_driver);
-- 
2.40.1