From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Purpose is catching illegal callers.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 81a83424fa13..51869496b299 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2916,6 +2916,8 @@ i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, int n);
static inline struct page *
i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
{
+ WARN_ON_ONCE(!mutex_is_locked(&obj->base.dev->struct_mutex));
+
if (WARN_ON(n >= obj->base.size >> PAGE_SHIFT))
return NULL;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5a6daeaef680..b54b5619e07f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5250,6 +5250,8 @@ i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, int n)
{
struct page *page;
+ WARN_ON_ONCE(!mutex_is_locked(&obj->base.dev->struct_mutex));
+
/* Only default objects have per-page dirty tracking */
if (WARN_ON(obj->ops != &i915_gem_object_ops))
return NULL;
--
1.9.1
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