DragonFlyBSD

Thanks for the update to Linux 4.4 drm. There is a subtle bug
in the usage of drm_plane_index() in function pan_display_atomic()
of drm_fb_helper.c, found by Matt Roper. For reference:

https://patchwork.kernel.org/patch/7889051/

Please apply the following patch:

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 69cbab5..1e103c4 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@ -1251,7 +1251,7 @ retry:
goto fail;

plane = mode_set->crtc->primary;
-        plane_mask |= drm_plane_index(plane);
+        plane_mask |= (1 << drm_plane_index(plane));
         plane->old_fb = plane->fb;
     }