linux-kernel - [PATCH v2 02/18] mfd: cros_ec_dev: Convert to platform remove callback returning void

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Date:   Thu, 23 Nov 2023 17:56:30 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Lee Jones <lee@...nel.org>
Cc:     Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH v2 02/18] mfd: cros_ec_dev: 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/mfd/cros_ec_dev.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 79d393b602bf..603b1cd52785 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -288,13 +288,12 @@ static int ec_device_probe(struct platform_device *pdev)
 	return retval;
 }

-static int ec_device_remove(struct platform_device *pdev)
+static void ec_device_remove(struct platform_device *pdev)
 {
 	struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);

 	mfd_remove_devices(ec->dev);
 	device_unregister(&ec->class_dev);
-	return 0;
 }

 static const struct platform_device_id cros_ec_id[] = {
@@ -309,7 +308,7 @@ static struct platform_driver cros_ec_dev_driver = {
 	},
 	.id_table = cros_ec_id,
 	.probe = ec_device_probe,
-	.remove = ec_device_remove,
+	.remove_new = ec_device_remove,
 };

 static int __init cros_ec_dev_init(void)
-- 
2.42.0