drm: Make sure drm_vblank_no_hw_counter isn't abused
authorDaniel Vetter <daniel.vetter@ffwll.ch>
Mon, 8 Aug 2016 16:24:53 +0000 (18:24 +0200)
committerSean Paul <seanpaul@chromium.org>
Mon, 8 Aug 2016 18:34:05 +0000 (14:34 -0400)
Shouldn't be possible since everyone kzallocs this, but better safe
than sorry. Random drive-by-idea really.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Rodrigo Vivi <rdorigo.vivi@intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1470673493-14304-1-git-send-email-daniel.vetter@ffwll.ch
drivers/gpu/drm/drm_irq.c

index 97c70642dbe1bc3f14f187ae4f822abf254e7965..c0c3f2006203d2a982932474f39b90009ef66594 100644 (file)
@@ -1826,6 +1826,7 @@ 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);