drm/i915: export error state ref handling

[deliverable/linux.git] / drivers / gpu / drm / drm_irq.c

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index a6a8643a6a77b112518e363cb656800e44a6513d..8bcce7866d368e12df7c86edb17ff235ba58f4a7 100644 (file)
--- 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;