linux-kernel - [PATCH] cdrom: gdrom: Convert to platform remove callback returning void

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Message-ID: <20240307180837.190626-2-u.kleine-koenig@pengutronix.de>
Date: Thu,  7 Mar 2024 19:08:37 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Jens Axboe <axboe@...nel.dk>,
	Hannes Reinecke <hare@...e.de>,
	Christian Brauner <brauner@...nel.org>,
	Jack Wang <jinpu.wang@...os.com>,
	Phillip Potter <phil@...lpotter.co.uk>
Cc: Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH] cdrom: gdrom: 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>
---
Hello,

there doesn't seem to exist a dedicated maintainer entry. The last few commits
were created by Jens.

Best regards
Uwe

 drivers/cdrom/gdrom.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index 9398beeb5d1e..eefdd422ad8e 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -831,7 +831,7 @@ static int probe_gdrom(struct platform_device *devptr)
 	return err;
 }

-static int remove_gdrom(struct platform_device *devptr)
+static void remove_gdrom(struct platform_device *devptr)
 {
 	blk_mq_free_tag_set(&gd.tag_set);
 	free_irq(HW_EVENT_GDROM_CMD, &gd);
@@ -842,13 +842,11 @@ static int remove_gdrom(struct platform_device *devptr)
 	unregister_cdrom(gd.cd_info);
 	kfree(gd.cd_info);
 	kfree(gd.toc);
-
-	return 0;
 }

 static struct platform_driver gdrom_driver = {
 	.probe = probe_gdrom,
-	.remove = remove_gdrom,
+	.remove_new = remove_gdrom,
 	.driver = {
 			.name = GDROM_DEV_NAME,
 	},

base-commit: 11afac187274a6177a7ac82997f8691c0f469e41
-- 
2.43.0