drm: Add acquire ctx parameter to ->plane_disable

Nouveau had a few direct calls to ->disable_plane, I replaced those
with drm_plane_force_disable. Same story for shmob.

Otherwise no code changes.

Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-5-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 6711933..526e74b 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -294,7 +294,7 @@ void drm_plane_force_disable(struct drm_plane *plane)
 	WARN_ON(drm_drv_uses_atomic_modeset(plane->dev));
 
 	plane->old_fb = plane->fb;
-	ret = plane->funcs->disable_plane(plane);
+	ret = plane->funcs->disable_plane(plane, NULL);
 	if (ret) {
 		DRM_ERROR("failed to disable plane with busy fb\n");
 		plane->old_fb = NULL;
@@ -473,7 +473,7 @@ static int __setplane_internal(struct drm_plane *plane,
 	/* No fb means shut it down */
 	if (!fb) {
 		plane->old_fb = plane->fb;
-		ret = plane->funcs->disable_plane(plane);
+		ret = plane->funcs->disable_plane(plane, ctx);
 		if (!ret) {
 			plane->crtc = NULL;
 			plane->fb = NULL;