diff options
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index 299fa2a19a90..877e2067534f 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -996,10 +996,16 @@ EXPORT_SYMBOL(drm_crtc_vblank_count_and_time); int drm_crtc_next_vblank_start(struct drm_crtc *crtc, ktime_t *vblanktime) { unsigned int pipe = drm_crtc_index(crtc); - struct drm_vblank_crtc *vblank = &crtc->dev->vblank[pipe]; - struct drm_display_mode *mode = &vblank->hwmode; + struct drm_vblank_crtc *vblank; + struct drm_display_mode *mode; u64 vblank_start; + if (!drm_dev_has_vblank(crtc->dev)) + return -EINVAL; + + vblank = &crtc->dev->vblank[pipe]; + mode = &vblank->hwmode; + if (!vblank->framedur_ns || !vblank->linedur_ns) return -EINVAL; |