[PATCH] drm/msm/mdp5: Don't leak some plane state

[Rob Clark]

On Thu, Aug 3, 2023 at 1:45 PM Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>
> Apparently no one noticed that mdp5 plane states leak like a sieve
> ever since we introduced plane_state->commit refcount a few years ago
> in 21a01abbe32a ("drm/atomic: Fix freeing connector/plane state too
> early by tracking commits, v3.")
>
> Fix it by using the right helpers.
>
> Fixes: 21a01abbe32a ("drm/atomic: Fix freeing connector/plane state too early by tracking commits, v3.")
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Rob Clark <robdclark at gmail.com>
> Cc: Abhinav Kumar <quic_abhinavk at quicinc.com>
> Cc: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> Cc: linux-arm-msm at vger.kernel.org
> Cc: freedreno at lists.freedesktop.org
> Reported-and-tested-by: dorum at noisolation.com
> Cc: dorum at noisolation.com
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>

Reviewed-by: Rob Clark <robdclark at gmail.com>

> ---
>  drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> index bd2c4ac45601..0d5ff03cb091 100644
> --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c
> @@ -130,8 +130,7 @@ static void mdp5_plane_destroy_state(struct drm_plane *plane,
>  {
>         struct mdp5_plane_state *pstate = to_mdp5_plane_state(state);
>
> -       if (state->fb)
> -               drm_framebuffer_put(state->fb);
> +       __drm_atomic_helper_plane_destroy_state(state);
>
>         kfree(pstate);
>  }
> --
> 2.40.1
>