drm/vmwgfx: Stop messing about with plane->fb/old_fb/crtc

plane->fb/old_fb/crtc should no longer be used by atomic
drivers. Stop messing about with them.

Cc: Deepak Rawat <drawat@vmware.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Sinclair Yeh <syeh@vmware.com>
Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180525185045.29689-7-ville.syrjala@linux.intel.com
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_fb.c

@@ -439,8 +439,6 @@ static int vmw_fb_compute_depth(struct fb_var_screeninfo *var,
 static int vmwgfx_set_config_internal(struct drm_mode_set *set)
 {
 	struct drm_crtc *crtc = set->crtc;
-	struct drm_framebuffer *fb;
-	struct drm_crtc *tmp;
 	struct drm_modeset_acquire_ctx *ctx;
 	struct drm_device *dev = set->crtc->dev;
 	int ret;
@@ -448,29 +446,7 @@ static int vmwgfx_set_config_internal(struct drm_mode_set *set)
 	ctx = dev->mode_config.acquire_ctx;
 
 restart:
-	/*
-	 * NOTE: ->set_config can also disable other crtcs (if we steal all
-	 * connectors from it), hence we need to refcount the fbs across all
-	 * crtcs. Atomic modeset will have saner semantics ...
-	 */
-	drm_for_each_crtc(tmp, dev)
-		tmp->primary->old_fb = tmp->primary->fb;
-
-	fb = set->fb;
-
 	ret = crtc->funcs->set_config(set, ctx);
-	if (ret == 0) {
-		crtc->primary->crtc = crtc;
-		crtc->primary->fb = fb;
-	}
-
-	drm_for_each_crtc(tmp, dev) {
-		if (tmp->primary->fb)
-			drm_framebuffer_get(tmp->primary->fb);
-		if (tmp->primary->old_fb)
-			drm_framebuffer_put(tmp->primary->old_fb);
-		tmp->primary->old_fb = NULL;
-	}
 
 	if (ret == -EDEADLK) {
 		dev->mode_config.acquire_ctx = NULL;