linux-kernel - Re: [PATCH] drm/mediatek: add exception handing in mtk_drm

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Message-ID: <CAAOTY__OPKHd+=WD_nfPJVbXh8As8CDi=tGzbMAtxBQXbzjQYg@mail.gmail.com>
Date:   Tue, 15 Sep 2020 07:38:51 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Yu Kuai <yukuai3@...wei.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        CK Hu <ck.hu@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>, yt.shen@...iatek.com,
        djkurtz@...omium.org, littlecvr@...omium.org,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, yi.zhang@...wei.com
Subject: Re: [PATCH] drm/mediatek: add exception handing in mtk_drm_probe() if
 component init fail

Hi, Yu Kuai:

Yu Kuai <yukuai3@...wei.com> 於 2020年9月9日 週三 下午4:50寫道：
>
> mtk_ddp_comp_init() is called in a loop in mtk_drm_probe(), if it
> fail, previous successive init component is not proccessed.
>
> Thus uninitialize valid component and put their device if component
> init failed.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>

>
> Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
>
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 040a8f393fe2..75a6cf231fd7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -544,8 +544,13 @@ static int mtk_drm_probe(struct platform_device *pdev)
>         pm_runtime_disable(dev);
>  err_node:
>         of_node_put(private->mutex_node);
> -       for (i = 0; i < DDP_COMPONENT_ID_MAX; i++)
> +       for (i = 0; i < DDP_COMPONENT_ID_MAX; i++) {
>                 of_node_put(private->comp_node[i]);
> +               if (private->ddp_comp[i]) {
> +                       put_device(private->ddp_comp[i]->larb_dev);
> +                       private->ddp_comp[i] = NULL;
> +               }
> +       }
>         return ret;
>  }
>
> --
> 2.25.4
>