drm/i915: Make unpin async.

All of intel_post_plane_update is handled there now, so move it over.
This is run after the hw state checker because it can't handle checking
crtc's separately yet.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463490484-19540-19-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>

drivers/gpu/drm/i915/intel_atomic.c

@@ -311,6 +311,17 @@ intel_atomic_state_alloc(struct drm_device *dev)
 void intel_atomic_state_clear(struct drm_atomic_state *s)
 {
 	struct intel_atomic_state *state = to_intel_atomic_state(s);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(state->work); i++) {
+		struct intel_flip_work *work = state->work[i];
+
+		if (work)
+			intel_free_flip_work(work);
+
+		state->work[i] = NULL;
+	}
+
 	drm_atomic_state_default_clear(&state->base);
 	state->dpll_set = state->modeset = false;
 }