linux-kernel - [PATCH 03/27] platform/chrome: cros_ec_lightbar: Convert to platform remove callback returning void

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Message-Id: <20230927081040.2198742-4-u.kleine-koenig@pengutronix.de>
Date:   Wed, 27 Sep 2023 10:10:16 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Benson Leung <bleung@...omium.org>,
        Tzung-Bi Shih <tzungbi@...nel.org>
Cc:     Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH 03/27] platform/chrome: cros_ec_lightbar: 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/platform/chrome/cros_ec_lightbar.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 376425bbd8ff..6677cc6c4984 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -560,7 +560,7 @@ static int cros_ec_lightbar_probe(struct platform_device *pd)
 	return ret;
 }
 
-static int cros_ec_lightbar_remove(struct platform_device *pd)
+static void cros_ec_lightbar_remove(struct platform_device *pd)
 {
 	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
 
@@ -569,8 +569,6 @@ static int cros_ec_lightbar_remove(struct platform_device *pd)
 
 	/* Let the EC take over the lightbar again. */
 	lb_manual_suspend_ctrl(ec_dev, 0);
-
-	return 0;
 }
 
 static int __maybe_unused cros_ec_lightbar_resume(struct device *dev)
@@ -603,7 +601,7 @@ static struct platform_driver cros_ec_lightbar_driver = {
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 	.probe = cros_ec_lightbar_probe,
-	.remove = cros_ec_lightbar_remove,
+	.remove_new = cros_ec_lightbar_remove,
 };
 
 module_platform_driver(cros_ec_lightbar_driver);
-- 
2.40.1