1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index a6a8643a6a77..8bcce7866d36 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1054,7 +1054,7 @@ EXPORT_SYMBOL(drm_vblank_off);
  */
 void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
 {
-        /* vblank is not initialized (IRQ not installed ?) */
+        /* vblank is not initialized (IRQ not installed ?), or has been freed */
         if (!dev->num_crtcs)
                 return;
         /*
@@ -1076,6 +1076,10 @@ void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
 {
         unsigned long irqflags;
 
+        /* vblank is not initialized (IRQ not installed ?), or has been freed */
+        if (!dev->num_crtcs)
+                return;
+
         if (dev->vblank_inmodeset[crtc]) {
                 spin_lock_irqsave(&dev->vbl_lock, irqflags);
                 dev->vblank_disable_allowed = 1;