linux-kernel - [PATCH 3/3] auxdisplay: img-ascii-lcd: Convert to platform remove callback returning void

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Message-ID:  <44de2d4c1fed6fe96b68ba9ad768d297b8f392a5.1710194084.git.u.kleine-koenig@pengutronix.de>
Date: Mon, 11 Mar 2024 22:59:24 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Andy Shevchenko <andy@...nel.org>
Cc: Paul Burton <paulburton@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 3/3] auxdisplay: img-ascii-lcd: 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/img-ascii-lcd.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/auxdisplay/img-ascii-lcd.c b/drivers/auxdisplay/img-ascii-lcd.c
index 925c4cd101e9..0c91e39389c1 100644
--- a/drivers/auxdisplay/img-ascii-lcd.c
+++ b/drivers/auxdisplay/img-ascii-lcd.c
@@ -279,13 +279,12 @@ static int img_ascii_lcd_probe(struct platform_device *pdev)
  *
  * Return: 0
  */
-static int img_ascii_lcd_remove(struct platform_device *pdev)
+static void img_ascii_lcd_remove(struct platform_device *pdev)
 {
 	struct img_ascii_lcd_ctx *ctx = platform_get_drvdata(pdev);
 
 	sysfs_remove_link(&pdev->dev.kobj, "message");
 	linedisp_unregister(&ctx->linedisp);
-	return 0;
 }
 
 static struct platform_driver img_ascii_lcd_driver = {
@@ -294,7 +293,7 @@ static struct platform_driver img_ascii_lcd_driver = {
 		.of_match_table	= img_ascii_lcd_matches,
 	},
 	.probe	= img_ascii_lcd_probe,
-	.remove	= img_ascii_lcd_remove,
+	.remove_new = img_ascii_lcd_remove,
 };
 module_platform_driver(img_ascii_lcd_driver);
 
-- 
2.43.0