linux-kernel - [PATCH RESEND] platform/goldfish: goldfish_pipe: Convert to platform remove callback returning void

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Message-ID: <20231112000029.151117-2-u.kleine-koenig@pengutronix.de>
Date:   Sun, 12 Nov 2023 01:00:30 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH RESEND] platform/goldfish: goldfish_pipe: 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,

this patch was part for a series containing 27 patches and the only one
that wasn't applied. Probably it was missed because it was only Cc:d to
lkml and had no other recipient.

Greg, you were the one accepting patches to this driver since 2021 (all
two! :-), could you please pick up this patch, too?

Best regards
Uwe

 drivers/platform/goldfish/goldfish_pipe.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index 7737d56191d7..061aa9647c19 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -915,12 +915,11 @@ static int goldfish_pipe_probe(struct platform_device *pdev)
 	return goldfish_pipe_device_init(pdev, dev);
 }

-static int goldfish_pipe_remove(struct platform_device *pdev)
+static void goldfish_pipe_remove(struct platform_device *pdev)
 {
 	struct goldfish_pipe_dev *dev = platform_get_drvdata(pdev);

 	goldfish_pipe_device_deinit(pdev, dev);
-	return 0;
 }

 static const struct acpi_device_id goldfish_pipe_acpi_match[] = {
@@ -937,7 +936,7 @@ MODULE_DEVICE_TABLE(of, goldfish_pipe_of_match);

 static struct platform_driver goldfish_pipe_driver = {
 	.probe = goldfish_pipe_probe,
-	.remove = goldfish_pipe_remove,
+	.remove_new = goldfish_pipe_remove,
 	.driver = {
 		.name = "goldfish_pipe",
 		.of_match_table = goldfish_pipe_of_match,

base-commit: 3ca112b71f35dd5d99fc4571a56b5fc6f0c15814
-- 
2.42.0