drm: drm_vblank_cleanup: WARN when refcount > 0

1/1

 drivers/gpu/drm/drm_vblank.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
index 3e61aeb..062cc17 100644
@@ -403,9 +403,15 @@ void drm_vblank_cleanup(struct drm_device *dev)
 		return;
 
 	for (pipe = 0; pipe < dev->num_crtcs; pipe++) {
+		unsigned int refcount;
 		struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
 
-		WARN_ON(atomic_read(&vblank->refcount) > 0);
+		refcount = atomic_read(&vblank->refcount);
+		if (refcount > 0) {
+			DRM_DEBUG("vblank refcount: %u in %s\n", refcount,
+				   __func__);
+			WARN_ON(refcount > 0);
+		}
 
 		WARN_ON(READ_ONCE(vblank->enabled) &&
 			drm_core_check_feature(dev, DRIVER_MODESET));

2.10.0

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Author: Chris Wilson <[email protected]>
Date:   Sun Nov 26 12:47:30 2017 +0000
    drm-tip: 2017y-11m-26d-12h-47m-01s UTC integration manifest

PrasannaKumar Muralidharan