[PATCH 01/12] bus: hisi_lpc: Convert to platform remove callback returning void - Uwe Kleine-König

From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Jay Fang <f.fangjian@huawei.com>, Arnd Bergmann <arnd@arndb.de>
Cc: linux-kernel@vger.kernel.org, kernel@pengutronix.de
Subject: [PATCH 01/12] bus: hisi_lpc: Convert to platform remove callback returning void
Date: Thu,  9 Nov 2023 21:28:31 +0100	[thread overview]
Message-ID: <20231109202830.4124591-2-u.kleine-koenig@pengutronix.de> (raw)
In-Reply-To: <20231109202830.4124591-1-u.kleine-koenig@pengutronix.de>

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@pengutronix.de>
---
 drivers/bus/hisi_lpc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index cdc4e38c113e..09340adbacc2 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -657,7 +657,7 @@ static int hisi_lpc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int hisi_lpc_remove(struct platform_device *pdev)
+static void hisi_lpc_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct hisi_lpc_dev *lpcdev = dev_get_drvdata(dev);
@@ -669,8 +669,6 @@ static int hisi_lpc_remove(struct platform_device *pdev)
 		of_platform_depopulate(dev);
 
 	logic_pio_unregister_range(range);
-
-	return 0;
 }
 
 static const struct of_device_id hisi_lpc_of_match[] = {
@@ -691,6 +689,6 @@ static struct platform_driver hisi_lpc_driver = {
 		.acpi_match_table = hisi_lpc_acpi_match,
 	},
 	.probe = hisi_lpc_probe,
-	.remove = hisi_lpc_remove,
+	.remove_new = hisi_lpc_remove,
 };
 builtin_platform_driver(hisi_lpc_driver);
-- 
2.42.0

