[PATCH] drm: Make sure drm_vblank_no_hw_counter isn't abused

[Daniel Vetter]

Shouldn't be possible since everyone kzallocs this, but better safe
than sorry. Random drive-by-idea really.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/drm_irq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index f5a9f8cef360..10611a936059 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1795,6 +1795,7 @@ EXPORT_SYMBOL(drm_crtc_handle_vblank);
  */
 u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe)
 {
+	WARN_ON_ONCE(dev->max_vblank_count != 0);
 	return 0;
 }
 EXPORT_SYMBOL(drm_vblank_no_hw_counter);
-- 
2.8.1