[PATCH] drm/mediatek: dpi: fix NULL dereference in mtk_dpi_bridge_atomic_check

[Hsin-Yi Wang]

On Mon, Jul 12, 2021 at 4:08 PM Frank Wunderlich <linux at fw-web.de> wrote:
>
> From: Frank Wunderlich <frank-w at public-files.de>
>
> bridge->driver_private is not set (NULL) so use bridge_to_dpi(bridge)
> like it's done in bridge_atomic_get_output_bus_fmts
>
> Fixes: ec8747c52434 ("drm/mediatek: dpi: Add bus format negotiation")
> Signed-off-by: Frank Wunderlich <frank-w at public-files.de>

Tested-by: Hsin-Yi Wang <hsinyi at chromium.org>

Tested on a mt8183 device.


> ---
>  drivers/gpu/drm/mediatek/mtk_dpi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index bced555648b0..a2eca1f66984 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -605,7 +605,7 @@ static int mtk_dpi_bridge_atomic_check(struct drm_bridge *bridge,
>                                        struct drm_crtc_state *crtc_state,
>                                        struct drm_connector_state *conn_state)
>  {
> -       struct mtk_dpi *dpi = bridge->driver_private;
> +       struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>         unsigned int out_bus_format;
>
>         out_bus_format = bridge_state->output_bus_cfg.format;
> --
> 2.25.1
>
>
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