[PATCH 3/5] drm/i915/frontbuffer: add low-level kref accessors

[Jani Nikula]

Add _raw accessors for front->ref to avoid direct access from outside of
intel_frontbuffer.c, in preparation for making struct intel_frontbuffer
opaque.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_frontbuffer.c       | 10 ++++++++++
 drivers/gpu/drm/i915/display/intel_frontbuffer.h       |  3 +++
 drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h |  4 ++--
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
index effb13e8a6bb..42defe2b7661 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
@@ -77,6 +77,16 @@ void intel_frontbuffer_bits_or(struct intel_frontbuffer *front, unsigned int bit
 	atomic_or(bits, &front->bits);
 }
 
+bool intel_frontbuffer_get_unless_zero_raw(struct intel_frontbuffer *front)
+{
+	return kref_get_unless_zero(&front->ref);
+}
+
+void intel_frontbuffer_get_raw(struct intel_frontbuffer *front)
+{
+	kref_get(&front->ref);
+}
+
 /**
  * frontbuffer_flush - flush frontbuffer
  * @i915: i915 device
diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.h b/drivers/gpu/drm/i915/display/intel_frontbuffer.h
index 827b0129da71..221f41096416 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.h
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.h
@@ -79,6 +79,9 @@ void intel_frontbuffer_flip(struct drm_i915_private *i915,
 
 void intel_frontbuffer_put(struct intel_frontbuffer *front);
 
+bool intel_frontbuffer_get_unless_zero_raw(struct intel_frontbuffer *front);
+void intel_frontbuffer_get_raw(struct intel_frontbuffer *front);
+
 struct intel_frontbuffer *
 intel_frontbuffer_get(struct drm_i915_gem_object *obj);
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h b/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h
index 9fbf14867a2a..22df3c70c8a6 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h
@@ -56,7 +56,7 @@ i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj)
 		if (!front)
 			break;
 
-		if (unlikely(!kref_get_unless_zero(&front->ref)))
+		if (unlikely(!intel_frontbuffer_get_unless_zero_raw(front)))
 			continue;
 
 		if (likely(front == rcu_access_pointer(obj->frontbuffer)))
@@ -92,7 +92,7 @@ i915_gem_object_set_frontbuffer(struct drm_i915_gem_object *obj,
 		drm_gem_object_put(intel_bo_to_drm_bo(obj));
 	} else if (rcu_access_pointer(obj->frontbuffer)) {
 		cur = rcu_dereference_protected(obj->frontbuffer, true);
-		kref_get(&cur->ref);
+		intel_frontbuffer_get_raw(cur);
 	} else {
 		drm_gem_object_get(intel_bo_to_drm_bo(obj));
 		rcu_assign_pointer(obj->frontbuffer, front);
-- 
2.39.2