Async update callbacks are expected to set the old_fb in the new_state so prepare/cleanup framebuffers are balanced.

Cc: stable@vger.kernel.org # v4.14+ Fixes: 224a4c970987 ("drm/msm: update cursors asynchronously through atomic") Suggested-by: Boris Brezillon boris.brezillon@collabora.com Signed-off-by: Helen Koike helen.koike@collabora.com

--- Hello,

As mentioned in the cover letter, But I couldn't test on MSM because I don't have the hardware and I would appreciate if anyone could test it.

In other platforms (VC4, AMD, Rockchip), there is a hidden drm_framebuffer_get(new_fb)/drm_framebuffer_put(old_fb) in async_update that is wrong, but I couldn't identify those here, not sure if it is hidden somewhere else, but if tests fail this is probably the cause.

Thanks! Helen

Changes in v2: - update CC stable and Fixes tag

drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c index be13140967b4..b854f471e9e5 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c @@ -502,6 +502,8 @@ static int mdp5_plane_atomic_async_check(struct drm_plane *plane, static void mdp5_plane_atomic_async_update(struct drm_plane *plane, struct drm_plane_state *new_state) { + struct drm_framebuffer *old_fb = plane->state->fb; + plane->state->src_x = new_state->src_x; plane->state->src_y = new_state->src_y; plane->state->crtc_x = new_state->crtc_x; @@ -524,6 +526,8 @@ static void mdp5_plane_atomic_async_update(struct drm_plane *plane,

*to_mdp5_plane_state(plane->state) = *to_mdp5_plane_state(new_state); + + new_state->fb = old_fb; }

static const struct drm_plane_helper_funcs mdp5_plane_helper_funcs = {