<pre>
Hi, Nancy:

On Fri, 2023-04-21 at 10:16 +0800, Nancy.Lin wrote:
> fix Smatch static checker warning
> - uninitialized symbol comp_pdev in mtk_ddp_comp_init.
>
> Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver
> for MT8195")
> Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
> ---
> v2: add Fixes tag
> ---
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index f114da4d36a9..e987ac4481bc 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -546,7 +546,7 @@ unsigned int
> mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
> int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp
> *comp,
> unsigned int comp_id)
> {
> -struct platform_device *comp_pdev;
> +struct platform_device *comp_pdev = NULL;
> enum mtk_ddp_comp_type type;
> struct mtk_ddp_comp_dev *priv;
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> @@ -588,6 +588,9 @@ int mtk_ddp_comp_init(struct device_node *node,
> struct mtk_ddp_comp *comp,
> type == MTK_DSI)
> return 0;
>
> +if (!comp_pdev)
> +return -EPROBE_DEFER;

In line 566, the statement is

if (nodo) {
comp_pdev = ...
}

The comment says that only ovl_adaptoer has no device node, so the
checking should be

if (type != MTK_DISP_OVL_ADAPTOR) {
comp_pdev = ...
}

and later it would return when type = MTK_DISP_OVL_ADAPTOR,
so there would be no problem of uninitialized symbol.

Regards,
CK

> +
> priv = devm_kzalloc(comp->dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;

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