linux-kernel - [PATCH 04/23] gpio: cadence: Convert to platform remove callback returning void

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230928070706.2290137-5-u.kleine-koenig@pengutronix.de>
Date:   Thu, 28 Sep 2023 09:06:47 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andy Shevchenko <andy@...nel.org>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 04/23] gpio: cadence: 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/gpio/gpio-cadence.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpio-cadence.c b/drivers/gpio/gpio-cadence.c
index 3720b90cad10..6a439cf78459 100644
--- a/drivers/gpio/gpio-cadence.c
+++ b/drivers/gpio/gpio-cadence.c
@@ -268,14 +268,12 @@ static int cdns_gpio_probe(struct platform_device *pdev)
 	return ret;
 }

-static int cdns_gpio_remove(struct platform_device *pdev)
+static void cdns_gpio_remove(struct platform_device *pdev)
 {
 	struct cdns_gpio_chip *cgpio = platform_get_drvdata(pdev);

 	iowrite32(cgpio->bypass_orig, cgpio->regs + CDNS_GPIO_BYPASS_MODE);
 	clk_disable_unprepare(cgpio->pclk);
-
-	return 0;
 }

 static const struct of_device_id cdns_of_ids[] = {
@@ -290,7 +288,7 @@ static struct platform_driver cdns_gpio_driver = {
 		.of_match_table = cdns_of_ids,
 	},
 	.probe = cdns_gpio_probe,
-	.remove = cdns_gpio_remove,
+	.remove_new = cdns_gpio_remove,
 };
 module_platform_driver(cdns_gpio_driver);

-- 
2.40.1