[Intel-gfx] [PATCH 3/3] drm/i915: Warn when releasing a frontbuffer while in use

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Let's scream if we are about to release a frontbuffer which
is still in use.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_frontbuffer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
index 7b38eee9980f..6fc6965b6133 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
@@ -224,6 +224,8 @@ static void frontbuffer_release(struct kref *ref)
 	struct drm_i915_gem_object *obj = front->obj;
 	struct i915_vma *vma;
 
+	drm_WARN_ON(obj->base.dev, atomic_read(&front->bits));
+
 	spin_lock(&obj->vma.lock);
 	for_each_ggtt_vma(vma, obj) {
 		i915_vma_clear_scanout(vma);
-- 
2.26.2