linux-kernel - [PATCH 2/3] auxdisplay: hd44780: Convert to platform remove callback returning void

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Message-ID:  <868dcff909d5056be2d548a249820b61fc2f0452.1710194084.git.u.kleine-koenig@pengutronix.de>
Date: Mon, 11 Mar 2024 22:59:23 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Andy Shevchenko <andy@...nel.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 2/3] auxdisplay: hd44780: 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/auxdisplay/hd44780.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index d56a5d508ccd..7ac0b1b1d548 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -319,7 +319,7 @@ static int hd44780_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int hd44780_remove(struct platform_device *pdev)
+static void hd44780_remove(struct platform_device *pdev)
 {
 	struct charlcd *lcd = platform_get_drvdata(pdev);
 	struct hd44780_common *hdc = lcd->drvdata;
@@ -329,7 +329,6 @@ static int hd44780_remove(struct platform_device *pdev)
 	kfree(lcd->drvdata);
 
 	kfree(lcd);
-	return 0;
 }
 
 static const struct of_device_id hd44780_of_match[] = {
@@ -340,7 +339,7 @@ MODULE_DEVICE_TABLE(of, hd44780_of_match);
 
 static struct platform_driver hd44780_driver = {
 	.probe = hd44780_probe,
-	.remove = hd44780_remove,
+	.remove_new = hd44780_remove,
 	.driver		= {
 		.name	= "hd44780",
 		.of_match_table = hd44780_of_match,
-- 
2.43.0