qxl_plane_cleanup_fb() unpins the just activated framebuffer
instead of the old one.  Oops.  Fix it.

Cc: Gabriel Krisman Bertazi <kris...@collabora.co.uk>
Fixes: 1277eed5fecb8830c8cc414ad70c1ef640464bc0
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c 
b/drivers/gpu/drm/qxl/qxl_display.c
index e1dd05423e..afbf50d0c0 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -702,14 +702,15 @@ static void qxl_plane_cleanup_fb(struct drm_plane *plane,
        struct drm_gem_object *obj;
        struct qxl_bo *user_bo;
 
-       if (!plane->state->fb) {
-               /* we never executed prepare_fb, so there's nothing to
+       if (!old_state->fb) {
+               /*
+                * we never executed prepare_fb, so there's nothing to
                 * unpin.
                 */
                return;
        }
 
-       obj = to_qxl_framebuffer(plane->state->fb)->obj;
+       obj = to_qxl_framebuffer(old_state->fb)->obj;
        user_bo = gem_to_qxl_bo(obj);
        qxl_bo_unpin(user_bo);
 }
-- 
2.9.3

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