[PATCH 52/81] drm/i915: don't update the fb base if there is no fb

[Daniel Vetter <daniel.vetter@ffwll.ch>]

Otherwise we'll set_fb complains pretty loudly if we the crtc is off
and userspace moves the NULL fb around a bit. Yeah, this actually
happens in the wild ...

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/intel_display.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 577b964..f90860f 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6828,7 +6828,7 @@ intel_set_config_compute_mode_changes(struct drm_mode_set *set,
 			config->fb_changed = true;
 	}
 
-	if (set->x != set->crtc->x || set->y != set->crtc->y)
+	if (set->fb && (set->x != set->crtc->x || set->y != set->crtc->y))
 		config->fb_changed = true;
 
 	if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
-- 
1.7.7.6