linux-kernel - [PATCH 01/58] mmc: sunxi: Convert to platform remove callback returning void

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Message-Id: <20230713080807.69999-1-frank.li@vivo.com>
Date:   Thu, 13 Jul 2023 16:07:10 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc:     Yangtao Li <frank.li@...o.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH 01/58] mmc: sunxi: 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 (mostly) ignored
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.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Signed-off-by: Yangtao Li <frank.li@...o.com>
---
 drivers/mmc/host/sunxi-mmc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index 69dcb8805e05..d3bd0ac99ec4 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c
@@ -1486,7 +1486,7 @@ static int sunxi_mmc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int sunxi_mmc_remove(struct platform_device *pdev)
+static void sunxi_mmc_remove(struct platform_device *pdev)
 {
 	struct mmc_host	*mmc = platform_get_drvdata(pdev);
 	struct sunxi_mmc_host *host = mmc_priv(mmc);
@@ -1499,8 +1499,6 @@ static int sunxi_mmc_remove(struct platform_device *pdev)
 	}
 	dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 	mmc_free_host(mmc);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM
@@ -1556,7 +1554,7 @@ static struct platform_driver sunxi_mmc_driver = {
 		.pm = &sunxi_mmc_pm_ops,
 	},
 	.probe		= sunxi_mmc_probe,
-	.remove		= sunxi_mmc_remove,
+	.remove_new	= sunxi_mmc_remove,
 };
 module_platform_driver(sunxi_mmc_driver);
 
-- 
2.39.0