linux-kernel - [PATCH 12/12] bus: ts-nbus: Convert to platform remove callback returning void

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Message-ID: <20231109202830.4124591-13-u.kleine-koenig@pengutronix.de>
Date:   Thu,  9 Nov 2023 21:28:42 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH 12/12] bus: ts-nbus: 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/ts-nbus.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/ts-nbus.c b/drivers/bus/ts-nbus.c
index 38c886dc2ed6..4fa932cb0915 100644
--- a/drivers/bus/ts-nbus.c
+++ b/drivers/bus/ts-nbus.c
@@ -331,7 +331,7 @@ static int ts_nbus_probe(struct platform_device *pdev)
 	return 0;
 }

-static int ts_nbus_remove(struct platform_device *pdev)
+static void ts_nbus_remove(struct platform_device *pdev)
 {
 	struct ts_nbus *ts_nbus = dev_get_drvdata(&pdev->dev);

@@ -339,8 +339,6 @@ static int ts_nbus_remove(struct platform_device *pdev)
 	mutex_lock(&ts_nbus->lock);
 	pwm_disable(ts_nbus->pwm);
 	mutex_unlock(&ts_nbus->lock);
-
-	return 0;
 }

 static const struct of_device_id ts_nbus_of_match[] = {
@@ -351,7 +349,7 @@ MODULE_DEVICE_TABLE(of, ts_nbus_of_match);

 static struct platform_driver ts_nbus_driver = {
 	.probe		= ts_nbus_probe,
-	.remove		= ts_nbus_remove,
+	.remove_new	= ts_nbus_remove,
 	.driver		= {
 		.name	= "ts_nbus",
 		.of_match_table = ts_nbus_of_match,
-- 
2.42.0