linux-kernel - [PATCH] char: xillybus: Convert to platform remove callback returning void

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Message-ID: <20240306175710.82569-2-u.kleine-koenig@pengutronix.de>
Date: Wed,  6 Mar 2024 18:57:10 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Eli Billauer <eli.billauer@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH] char: xillybus: 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/char/xillybus/xillybus_of.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/char/xillybus/xillybus_of.c b/drivers/char/xillybus/xillybus_of.c
index e5372e45d211..8802e2a6fd20 100644
--- a/drivers/char/xillybus/xillybus_of.c
+++ b/drivers/char/xillybus/xillybus_of.c
@@ -64,19 +64,17 @@ static int xilly_drv_probe(struct platform_device *op)
 	return xillybus_endpoint_discovery(endpoint);
 }

-static int xilly_drv_remove(struct platform_device *op)
+static void xilly_drv_remove(struct platform_device *op)
 {
 	struct device *dev = &op->dev;
 	struct xilly_endpoint *endpoint = dev_get_drvdata(dev);

 	xillybus_endpoint_remove(endpoint);
-
-	return 0;
 }

 static struct platform_driver xillybus_platform_driver = {
 	.probe = xilly_drv_probe,
-	.remove = xilly_drv_remove,
+	.remove_new = xilly_drv_remove,
 	.driver = {
 		.name = xillyname,
 		.of_match_table = xillybus_of_match,

base-commit: 11afac187274a6177a7ac82997f8691c0f469e41
-- 
2.43.0