[PATCH v3, 08/15] drm/mediatek: check if fb is null

[Chun-Kuang Hu]

Hi, Yongqiang:

Yongqiang Niu <yongqiang.niu at mediatek.com> 於 2021年1月11日 週一 下午3:48寫道：
>
> It's possible that state->base.fb is null. Add a check before access its
> format.

Applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

>
> Fixes: b6b1bb980ec4 ( drm/mediatek: Turn off Alpha bit when plane format has no alpha)
> Signed-off-by: Yongqiang Niu <yongqiang.niu at mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 4934bee..8e7f494 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -279,7 +279,7 @@ static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
>         }
>
>         con = ovl_fmt_convert(ovl, fmt);
> -       if (state->base.fb->format->has_alpha)
> +       if (state->base.fb && state->base.fb->format->has_alpha)
>                 con |= OVL_CON_AEN | OVL_CON_ALPHA;
>
>         if (pending->rotation & DRM_MODE_REFLECT_Y) {
> --
> 1.8.1.1.dirty
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