<pre>
Hi, Jason:

On Fri, 2023-07-28 at 00:41 +0800, Jason-JH.Lin wrote:
> Add checking the length of each data path before assigning drm
> private
> data into all_drm_priv array.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

>
> Fixes: 1ef7ed48356c ("drm/mediatek: Modify mediatek-drm for mt8195
> multi mmsys support")
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 16 +++++++++++++---
> 1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 249c9fd6347e..d2fb1fb4e682 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -351,6 +351,7 @@ static bool mtk_drm_get_all_drm_priv(struct
> device *dev)
> {
> struct mtk_drm_private *drm_priv = dev_get_drvdata(dev);
> struct mtk_drm_private *all_drm_priv[MAX_CRTC];
> +struct mtk_drm_private *temp_drm_priv;
> struct device_node *phandle = dev->parent->of_node;
> const struct of_device_id *of_id;
> struct device_node *node;
> @@ -373,9 +374,18 @@ static bool mtk_drm_get_all_drm_priv(struct
> device *dev)
> if (!drm_dev || !dev_get_drvdata(drm_dev))
> continue;
>
> -all_drm_priv[cnt] = dev_get_drvdata(drm_dev);
> -if (all_drm_priv[cnt] && all_drm_priv[cnt]-
> >mtk_drm_bound)
> -cnt++;
> +temp_drm_priv = dev_get_drvdata(drm_dev);
> +if (temp_drm_priv) {
> +if (temp_drm_priv->mtk_drm_bound)
> +cnt++;
> +
> +if (temp_drm_priv->data->main_len)
> +all_drm_priv[0] = temp_drm_priv;
> +else if (temp_drm_priv->data->ext_len)
> +all_drm_priv[1] = temp_drm_priv;
> +else if (temp_drm_priv->data->third_len)
> +all_drm_priv[2] = temp_drm_priv;
> +}
> }
>
> if (drm_priv->data->mmsys_dev_num == cnt) {

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