linux-kernel - [PATCH 05/12] bus: simple-pm-bus: Convert to platform remove callback returning void

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Message-ID: <20231109202830.4124591-6-u.kleine-koenig@pengutronix.de>
Date:   Thu,  9 Nov 2023 21:28:35 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Liu Ying <victor.liu@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Nick Alcock <nick.alcock@...cle.com>,
        Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH 05/12] bus: simple-pm-bus: 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() will be 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/bus/simple-pm-bus.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c
index aafcc481de91..50870c827889 100644
--- a/drivers/bus/simple-pm-bus.c
+++ b/drivers/bus/simple-pm-bus.c
@@ -74,17 +74,16 @@ static int simple_pm_bus_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int simple_pm_bus_remove(struct platform_device *pdev)
+static void simple_pm_bus_remove(struct platform_device *pdev)
 {
 	const void *data = of_device_get_match_data(&pdev->dev);
 
 	if (pdev->driver_override || data)
-		return 0;
+		return;
 
 	dev_dbg(&pdev->dev, "%s\n", __func__);
 
 	pm_runtime_disable(&pdev->dev);
-	return 0;
 }
 
 static int simple_pm_bus_runtime_suspend(struct device *dev)
@@ -129,7 +128,7 @@ MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match);
 
 static struct platform_driver simple_pm_bus_driver = {
 	.probe = simple_pm_bus_probe,
-	.remove = simple_pm_bus_remove,
+	.remove_new = simple_pm_bus_remove,
 	.driver = {
 		.name = "simple-pm-bus",
 		.of_match_table = simple_pm_bus_of_match,
-- 
2.42.0