[PATCH] drm/amd/display: Fix null pointer when setting backlight

[Alex Deucher]

On Wed, Mar 14, 2018 at 9:55 AM, Harry Wentland <harry.wentland at amd.com> wrote:
> Fixes: c894d9f208f9 (drm/amd/display: Fixed dim around 1sec when resume
> from S3)
>
> Signed-off-by: Harry Wentland <harry.wentland at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/display/dc/core/dc_link.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> index e6d5dcb35e96..eeb04471b2f5 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
> @@ -1960,10 +1960,12 @@ bool dc_link_set_backlight_level(const struct dc_link *link, uint32_t level,
>                 (abm->funcs->set_backlight_level == NULL))
>                 return false;
>
> -       if (stream->bl_pwm_level == 0)
> -               frame_ramp = 0;
> +       if (stream) {
> +               if (stream->bl_pwm_level == 0)
> +                       frame_ramp = 0;
>
> -       ((struct dc_stream_state *)stream)->bl_pwm_level = level;
> +               ((struct dc_stream_state *)stream)->bl_pwm_level = level;
> +       }
>
>         use_smooth_brightness = dmcu->funcs->is_dmcu_initialized(dmcu);
>
> --
> 2.14.1
>
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