1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 14b024becb91..98371eeac77c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2982,6 +2982,30 @@ static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
         return pending;
 }
 
+bool intel_has_pending_fb_unpin(struct drm_device *dev)
+{
+        struct intel_crtc *crtc;
+
+        /* Note that we don't need to be called with mode_config.lock here
+         * as our list of CRTC objects is static for the lifetime of the
+         * device and so cannot disappear as we iterate. Similarly, we can
+         * happily treat the predicates as racy, atomic checks as userspace
+         * cannot claim and pin a new fb without at least acquring the
+         * struct_mutex and so serialising with us.
+         */
+        list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head) {
+                if (atomic_read(&crtc->unpin_work_count) == 0)
+                        continue;
+
+                if (crtc->unpin_work)
+                        intel_wait_for_vblank(dev, crtc->pipe);
+
+                return true;
+        }
+
+        return false;
+}
+
 static void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
 {
         struct drm_device *dev = crtc->dev;