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Message-ID: <671f4976-46e6-4873-98b2-89df896e4a4f@collabora.com>
Date: Thu, 16 May 2024 12:12:00 +0200
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Subject: Re: [PATCH 2/4] drm/mediatek: Convert to platform remove callback
 returning void
To: =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>,
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>,
 Philipp Zabel <p.zabel@pengutronix.de>,
 Matthias Brugger <matthias.bgg@gmail.com>, dri-devel@lists.freedesktop.org,
 linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org
References: <cover.1712681770.git.u.kleine-koenig@pengutronix.de>
 <4a64dfbfbcfdf9b7cd46bc8026223e69a4b453b4.1712681770.git.u.kleine-koenig@pengutronix.de>
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Content-Language: en-US
In-Reply-To: <4a64dfbfbcfdf9b7cd46bc8026223e69a4b453b4.1712681770.git.u.kleine-koenig@pengutronix.de>
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Il 09/04/24 19:02, Uwe Kleine-König ha scritto:
> 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>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

> ---
>   drivers/gpu/drm/mediatek/mtk_padding.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_padding.c b/drivers/gpu/drm/mediatek/mtk_padding.c
> index 0d6451c149b6..9f92b720aaae 100644
> --- a/drivers/gpu/drm/mediatek/mtk_padding.c
> +++ b/drivers/gpu/drm/mediatek/mtk_padding.c
> @@ -137,10 +137,9 @@ static int mtk_padding_probe(struct platform_device *pdev)
>   	return 0;
>   }
>   
> -static int mtk_padding_remove(struct platform_device *pdev)
> +static void mtk_padding_remove(struct platform_device *pdev)
>   {
>   	component_del(&pdev->dev, &mtk_padding_component_ops);
> -	return 0;
>   }
>   
>   static const struct of_device_id mtk_padding_driver_dt_match[] = {
> @@ -151,7 +150,7 @@ MODULE_DEVICE_TABLE(of, mtk_padding_driver_dt_match);
>   
>   struct platform_driver mtk_padding_driver = {
>   	.probe		= mtk_padding_probe,
> -	.remove		= mtk_padding_remove,
> +	.remove_new	= mtk_padding_remove,
>   	.driver		= {
>   		.name	= "mediatek-disp-padding",
>   		.owner	= THIS_MODULE,