linux-kernel - [PATCH 1/3] auxdisplay: cfag12864bfb: Convert to platform remove callback returning void

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Date: Mon, 11 Mar 2024 22:59:22 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Andy Shevchenko <andy@...nel.org>
Cc: Miguel Ojeda <ojeda@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 1/3] auxdisplay: cfag12864bfb: 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/cfag12864bfb.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/auxdisplay/cfag12864bfb.c b/drivers/auxdisplay/cfag12864bfb.c
index 5ba19c339f08..2b74dabe7e17 100644
--- a/drivers/auxdisplay/cfag12864bfb.c
+++ b/drivers/auxdisplay/cfag12864bfb.c
@@ -96,7 +96,7 @@ static int cfag12864bfb_probe(struct platform_device *device)
 	return ret;
 }

-static int cfag12864bfb_remove(struct platform_device *device)
+static void cfag12864bfb_remove(struct platform_device *device)
 {
 	struct fb_info *info = platform_get_drvdata(device);

@@ -104,13 +104,11 @@ static int cfag12864bfb_remove(struct platform_device *device)
 		unregister_framebuffer(info);
 		framebuffer_release(info);
 	}
-
-	return 0;
 }

 static struct platform_driver cfag12864bfb_driver = {
 	.probe	= cfag12864bfb_probe,
-	.remove = cfag12864bfb_remove,
+	.remove_new = cfag12864bfb_remove,
 	.driver = {
 		.name	= CFAG12864BFB_NAME,
 	},
-- 
2.43.0