From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Mon, 8 Aug 2016 16:24:53 +0000 (+0200)
Subject: drm: Make sure drm_vblank_no_hw_counter isn't abused
X-Git-Tag: v4.9-rc1~41^2~41^2~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=cfc5adea1955ee8ddb62cc0d20ee454472033b6a;p=thirdparty%2Fkernel%2Flinux.git

drm: Make sure drm_vblank_no_hw_counter isn't abused

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
---

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 97c70642dbe1b..c0c3f2006203d 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -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);