1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index d8d65f4232a9..4c68f76993d8 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2617,6 +2617,15 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
                 goto out;
         crtc = obj_to_crtc(obj);
 
+        if (crtc->fb == NULL) {
+                /* The framebuffer is currently unbound, presumably
+                 * due to a hotplug event, that userspace has not
+                 * yet discovered.
+                 */
+                ret = -EBUSY;
+                goto out;
+        }
+
         if (crtc->funcs->page_flip == NULL)
                 goto out;