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Message-ID: <6d73b0a4-34e6-44ce-8757-4f4931c3da85@enneenne.com>
Date: Fri, 8 Mar 2024 09:57:29 +0100
From: Rodolfo Giometti <giometti@...eenne.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH] pps: clients: gpio: Convert to platform remove callback
returning void
On 08/03/24 09:51, Uwe Kleine-König wrote:
> 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>
Acked-by: Rodolfo Giometti <giometti@...eenne.com>
> ---
> 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
--
GNU/Linux Solutions e-mail: giometti@...eenne.com
Linux Device Driver giometti@...ux.it
Embedded Systems phone: +39 349 2432127
UNIX programming
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