2019-11-18 06:20:08

by Pi-Hsun Shih

Subject: [PATCH] drm/mediatek: Check return value of mtk_drm_ddp_comp_for_plane.

The mtk_drm_ddp_comp_for_plane can return NULL, but the usage doesn't
check for it. Add check for it.

Fixes: d6b53f68356f ("drm/mediatek: Add helper to get component for a plane")
Signed-off-by: Pi-Hsun Shih <[email protected]>
---
drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index f80a8ba75977..4c4f976c994e 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -310,7 +310,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)

plane_state = to_mtk_plane_state(plane->state);
comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
- mtk_ddp_comp_layer_config(comp, local_layer, plane_state);
+ if (comp)
+ mtk_ddp_comp_layer_config(comp, local_layer,
+ plane_state);
}

return 0;
@@ -386,8 +388,9 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
comp = mtk_drm_ddp_comp_for_plane(crtc, plane,
&local_layer);

- mtk_ddp_comp_layer_config(comp, local_layer,
- plane_state);
+ if (comp)
+ mtk_ddp_comp_layer_config(comp, local_layer,
+ plane_state);
plane_state->pending.config = false;
}
mtk_crtc->pending_planes = false;
@@ -401,7 +404,9 @@ int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
struct mtk_ddp_comp *comp;

comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
- return mtk_ddp_comp_layer_check(comp, local_layer, state);
+ if (comp)
+ return mtk_ddp_comp_layer_check(comp, local_layer, state);
+ return 0;
}

static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,

base-commit: 5a6fcbeabe3e20459ed8504690b2515dacc5246f
--
2.24.0.432.g9d3f5f5b63-goog

2019-11-22 08:04:20

by CK Hu (胡俊光)

Subject: Re: [PATCH] drm/mediatek: Check return value of mtk_drm_ddp_comp_for_plane.

Hi, Pi-Hsun:

On Mon, 2019-11-18 at 14:18 +0800, Pi-Hsun Shih wrote:
> The mtk_drm_ddp_comp_for_plane can return NULL, but the usage doesn't
> check for it. Add check for it.

Reviewed-by: CK Hu <[email protected]>

>
> Fixes: d6b53f68356f ("drm/mediatek: Add helper to get component for a plane")
> Signed-off-by: Pi-Hsun Shih <[email protected]>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index f80a8ba75977..4c4f976c994e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -310,7 +310,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
>
> plane_state = to_mtk_plane_state(plane->state);
> comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
> - mtk_ddp_comp_layer_config(comp, local_layer, plane_state);
> + if (comp)
> + mtk_ddp_comp_layer_config(comp, local_layer,
> + plane_state);
> }
>
> return 0;
> @@ -386,8 +388,9 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
> comp = mtk_drm_ddp_comp_for_plane(crtc, plane,
> &local_layer);
>
> - mtk_ddp_comp_layer_config(comp, local_layer,
> - plane_state);
> + if (comp)
> + mtk_ddp_comp_layer_config(comp, local_layer,
> + plane_state);
> plane_state->pending.config = false;
> }
> mtk_crtc->pending_planes = false;
> @@ -401,7 +404,9 @@ int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
> struct mtk_ddp_comp *comp;
>
> comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
> - return mtk_ddp_comp_layer_check(comp, local_layer, state);
> + if (comp)
> + return mtk_ddp_comp_layer_check(comp, local_layer, state);
> + return 0;
> }
>
> static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,
>
> base-commit: 5a6fcbeabe3e20459ed8504690b2515dacc5246f

2019-12-12 04:50:00

by CK Hu (胡俊光)

Subject: Re: [PATCH] drm/mediatek: Check return value of mtk_drm_ddp_comp_for_plane.

Hi, Pi-Hsun:

On Fri, 2019-11-22 at 15:58 +0800, CK Hu wrote:
> Hi, Pi-Hsun:
>
> On Mon, 2019-11-18 at 14:18 +0800, Pi-Hsun Shih wrote:
> > The mtk_drm_ddp_comp_for_plane can return NULL, but the usage doesn't
> > check for it. Add check for it.
>
> Reviewed-by: CK Hu <[email protected]>
>

Applied to mediatek-drm-fixes-5.5 [1], thanks.

[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-fixes-5.5

Regards,
CK

> >
> > Fixes: d6b53f68356f ("drm/mediatek: Add helper to get component for a plane")
> > Signed-off-by: Pi-Hsun Shih <[email protected]>
> > ---
> > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 13 +++++++++----
> > 1 file changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index f80a8ba75977..4c4f976c994e 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -310,7 +310,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> >
> > plane_state = to_mtk_plane_state(plane->state);
> > comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
> > - mtk_ddp_comp_layer_config(comp, local_layer, plane_state);
> > + if (comp)
> > + mtk_ddp_comp_layer_config(comp, local_layer,
> > + plane_state);
> > }
> >
> > return 0;
> > @@ -386,8 +388,9 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
> > comp = mtk_drm_ddp_comp_for_plane(crtc, plane,
> > &local_layer);
> >
> > - mtk_ddp_comp_layer_config(comp, local_layer,
> > - plane_state);
> > + if (comp)
> > + mtk_ddp_comp_layer_config(comp, local_layer,
> > + plane_state);
> > plane_state->pending.config = false;
> > }
> > mtk_crtc->pending_planes = false;
> > @@ -401,7 +404,9 @@ int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
> > struct mtk_ddp_comp *comp;
> >
> > comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
> > - return mtk_ddp_comp_layer_check(comp, local_layer, state);
> > + if (comp)
> > + return mtk_ddp_comp_layer_check(comp, local_layer, state);
> > + return 0;
> > }
> >
> > static void mtk_drm_crtc_atomic_enable(struct drm_crtc *crtc,
> >
> > base-commit: 5a6fcbeabe3e20459ed8504690b2515dacc5246f
>