linux-kernel - [PATCH 6/8] regulator: userspace-consumer: Convert to platform remove callback returning void

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Message-ID:  <89c5f261707bf178e1508cf5dd55121f0da2dc3f.1701778038.git.u.kleine-koenig@pengutronix.de>
Date:   Tue,  5 Dec 2023 13:26:21 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH 6/8] regulator: userspace-consumer: 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/regulator/userspace-consumer.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
index 97f075ed68c9..53d1b9d6f69c 100644
--- a/drivers/regulator/userspace-consumer.c
+++ b/drivers/regulator/userspace-consumer.c
@@ -194,7 +194,7 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int regulator_userspace_consumer_remove(struct platform_device *pdev)
+static void regulator_userspace_consumer_remove(struct platform_device *pdev)
 {
 	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
 
@@ -202,8 +202,6 @@ static int regulator_userspace_consumer_remove(struct platform_device *pdev)
 
 	if (data->enabled && !data->no_autoswitch)
 		regulator_bulk_disable(data->num_supplies, data->supplies);
-
-	return 0;
 }
 
 static const struct of_device_id regulator_userspace_consumer_of_match[] = {
@@ -213,7 +211,7 @@ static const struct of_device_id regulator_userspace_consumer_of_match[] = {
 
 static struct platform_driver regulator_userspace_consumer_driver = {
 	.probe		= regulator_userspace_consumer_probe,
-	.remove		= regulator_userspace_consumer_remove,
+	.remove_new	= regulator_userspace_consumer_remove,
 	.driver		= {
 		.name		= "reg-userspace-consumer",
 		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
-- 
2.42.0