linux-kernel - [PATCH 09/27] platform/chrome: cros_usbpd_notify: Convert to platform remove callback returning void

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Message-Id: <20230927081040.2198742-10-u.kleine-koenig@pengutronix.de>
Date:   Wed, 27 Sep 2023 10:10:22 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Tzung-Bi Shih <tzungbi@...nel.org>
Cc:     chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH 09/27] platform/chrome: cros_usbpd_notify: 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_usbpd_notify.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
index 10670b6588e3..aacad022f21d 100644
--- a/drivers/platform/chrome/cros_usbpd_notify.c
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -134,15 +134,13 @@ static int cros_usbpd_notify_probe_acpi(struct platform_device *pdev)
 	return 0;
 }
 
-static int cros_usbpd_notify_remove_acpi(struct platform_device *pdev)
+static void cros_usbpd_notify_remove_acpi(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct acpi_device *adev = ACPI_COMPANION(dev);
 
 	acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
 				   cros_usbpd_notify_acpi);
-
-	return 0;
 }
 
 static const struct acpi_device_id cros_usbpd_notify_acpi_device_ids[] = {
@@ -157,7 +155,7 @@ static struct platform_driver cros_usbpd_notify_acpi_driver = {
 		.acpi_match_table = cros_usbpd_notify_acpi_device_ids,
 	},
 	.probe = cros_usbpd_notify_probe_acpi,
-	.remove = cros_usbpd_notify_remove_acpi,
+	.remove_new = cros_usbpd_notify_remove_acpi,
 };
 
 #endif /* CONFIG_ACPI */
@@ -209,7 +207,7 @@ static int cros_usbpd_notify_probe_plat(struct platform_device *pdev)
 	return 0;
 }
 
-static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
+static void cros_usbpd_notify_remove_plat(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
@@ -218,8 +216,6 @@ static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
 
 	blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier,
 					   &pdnotify->nb);
-
-	return 0;
 }
 
 static struct platform_driver cros_usbpd_notify_plat_driver = {
@@ -227,7 +223,7 @@ static struct platform_driver cros_usbpd_notify_plat_driver = {
 		.name = DRV_NAME,
 	},
 	.probe = cros_usbpd_notify_probe_plat,
-	.remove = cros_usbpd_notify_remove_plat,
+	.remove_new = cros_usbpd_notify_remove_plat,
 };
 
 static int __init cros_usbpd_notify_init(void)
-- 
2.40.1