[Intel-gfx] [PATCH 1/2] drm/i915: Catch premature unpinning of pages

[Chris Wilson]

Try to catch the violation of unpinning the backing storage whilst still
bound to the GPU.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 33c44c631bab..6c8a104b42ed 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3181,14 +3181,15 @@ i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
 
 static inline void i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 {
-	BUG_ON(obj->pages == NULL);
+	GEM_BUG_ON(obj->pages == NULL);
 	obj->pages_pin_count++;
 }
 
 static inline void i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
 {
-	BUG_ON(obj->pages_pin_count == 0);
+	GEM_BUG_ON(obj->pages_pin_count == 0);
 	obj->pages_pin_count--;
+	GEM_BUG_ON(obj->pages_pin_count < obj->bind_count);
 }
 
 enum i915_map_type {
-- 
2.9.3