linux-kernel - [PATCH 06/11] misc: open-dice: Convert to platform remove callback returning void

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Message-ID:  <8e7179794ffbcaa4ad3d0db50cc4aa03f377fc8c.1708508896.git.u.kleine-koenig@pengutronix.de>
Date: Wed, 21 Feb 2024 10:53:50 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: kernel@...gutronix.de,
	linux-kernel@...r.kernel.org
Subject: [PATCH 06/11] misc: open-dice: 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/misc/open-dice.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/open-dice.c b/drivers/misc/open-dice.c
index d279a4f195e2..1e3eb2aa44d9 100644
--- a/drivers/misc/open-dice.c
+++ b/drivers/misc/open-dice.c
@@ -165,12 +165,11 @@ static int __init open_dice_probe(struct platform_device *pdev)
 	return 0;
 }

-static int open_dice_remove(struct platform_device *pdev)
+static void open_dice_remove(struct platform_device *pdev)
 {
 	struct open_dice_drvdata *drvdata = platform_get_drvdata(pdev);

 	misc_deregister(&drvdata->misc);
-	return 0;
 }

 static const struct of_device_id open_dice_of_match[] = {
@@ -179,7 +178,7 @@ static const struct of_device_id open_dice_of_match[] = {
 };

 static struct platform_driver open_dice_driver = {
-	.remove = open_dice_remove,
+	.remove_new = open_dice_remove,
 	.driver = {
 		.name = DRIVER_NAME,
 		.of_match_table = open_dice_of_match,
-- 
2.43.0