linux-kernel - [PATCH 15/27] platform/mellanox: mlxbf-tmfifo: Convert to platform remove callback returning void

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Message-Id: <20230927081040.2198742-16-u.kleine-koenig@pengutronix.de>
Date:   Wed, 27 Sep 2023 10:10:28 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH 15/27] platform/mellanox: mlxbf-tmfifo: 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/platform/mellanox/mlxbf-tmfifo.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/mellanox/mlxbf-tmfifo.c b/drivers/platform/mellanox/mlxbf-tmfifo.c
index f3696a54a2bd..69729ba8f505 100644
--- a/drivers/platform/mellanox/mlxbf-tmfifo.c
+++ b/drivers/platform/mellanox/mlxbf-tmfifo.c
@@ -1361,13 +1361,11 @@ static int mlxbf_tmfifo_probe(struct platform_device *pdev)
 }
 
 /* Device remove function. */
-static int mlxbf_tmfifo_remove(struct platform_device *pdev)
+static void mlxbf_tmfifo_remove(struct platform_device *pdev)
 {
 	struct mlxbf_tmfifo *fifo = platform_get_drvdata(pdev);
 
 	mlxbf_tmfifo_cleanup(fifo);
-
-	return 0;
 }
 
 static const struct acpi_device_id mlxbf_tmfifo_acpi_match[] = {
@@ -1378,7 +1376,7 @@ MODULE_DEVICE_TABLE(acpi, mlxbf_tmfifo_acpi_match);
 
 static struct platform_driver mlxbf_tmfifo_driver = {
 	.probe = mlxbf_tmfifo_probe,
-	.remove = mlxbf_tmfifo_remove,
+	.remove_new = mlxbf_tmfifo_remove,
 	.driver = {
 		.name = "bf-tmfifo",
 		.acpi_match_table = mlxbf_tmfifo_acpi_match,
-- 
2.40.1