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Message-ID: <671f4976-46e6-4873-98b2-89df896e4a4f@collabora.com>
Date: Thu, 16 May 2024 12:12:00 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Matthias Brugger <matthias.bgg@...il.com>, dri-devel@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] drm/mediatek: Convert to platform remove callback
returning void
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@...gutronix.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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,
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