linux-kernel - [PATCH] pps: clients: gpio: Convert to platform remove callback returning void

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Message-ID:  <f4b9402af72e5f285c8b0f068076a76418f653f5.1709886922.git.u.kleine-koenig@pengutronix.de>
Date: Fri,  8 Mar 2024 09:51:15 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Rodolfo Giometti <giometti@...eenne.com>
Cc: linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH] pps: clients: gpio: 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/pps/clients/pps-gpio.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
index 2f4b11b4dfcd..791fdc9326dd 100644
--- a/drivers/pps/clients/pps-gpio.c
+++ b/drivers/pps/clients/pps-gpio.c
@@ -220,7 +220,7 @@ static int pps_gpio_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int pps_gpio_remove(struct platform_device *pdev)
+static void pps_gpio_remove(struct platform_device *pdev)
 {
 	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
 
@@ -229,7 +229,6 @@ static int pps_gpio_remove(struct platform_device *pdev)
 	/* reset echo pin in any case */
 	gpiod_set_value(data->echo_pin, 0);
 	dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);
-	return 0;
 }
 
 static const struct of_device_id pps_gpio_dt_ids[] = {
@@ -240,7 +239,7 @@ MODULE_DEVICE_TABLE(of, pps_gpio_dt_ids);
 
 static struct platform_driver pps_gpio_driver = {
 	.probe		= pps_gpio_probe,
-	.remove		= pps_gpio_remove,
+	.remove_new	= pps_gpio_remove,
 	.driver		= {
 		.name	= PPS_GPIO_NAME,
 		.of_match_table	= pps_gpio_dt_ids,

base-commit: 8ffc8b1bbd505e27e2c8439d326b6059c906c9dd
-- 
2.43.0