linux-kernel - [PATCH v2 16/18] mfd: ti_am335x_tscadc: Convert to platform remove callback returning void

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Message-ID: <20231123165627.492259-17-u.kleine-koenig@pengutronix.de>
Date:   Thu, 23 Nov 2023 17:56:44 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Lee Jones <lee@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH v2 16/18] mfd: ti_am335x_tscadc: 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/mfd/ti_am335x_tscadc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index b88eb70c17b3..4bbd542d753e 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -298,7 +298,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
 	return err;
 }

-static int ti_tscadc_remove(struct platform_device *pdev)
+static void ti_tscadc_remove(struct platform_device *pdev)
 {
 	struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);

@@ -308,8 +308,6 @@ static int ti_tscadc_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);

 	mfd_remove_devices(tscadc->dev);
-
-	return 0;
 }

 static int __maybe_unused ti_tscadc_can_wakeup(struct device *dev, void *data)
@@ -381,7 +379,7 @@ static struct platform_driver ti_tscadc_driver = {
 		.of_match_table = ti_tscadc_dt_ids,
 	},
 	.probe	= ti_tscadc_probe,
-	.remove	= ti_tscadc_remove,
+	.remove_new = ti_tscadc_remove,

 };

-- 
2.42.0