drm/mode: introduce wrapper to read framebuffer refcount.

Avoids drivers knowing where the kref is stored.

[airlied: add kerneldoc]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 6f43f9487aee..1c99ee09c9a0 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -2605,6 +2605,17 @@ static inline uint32_t drm_color_lut_extract(uint32_t user_input,
 	return clamp_val(val, 0, max);
 }
 
+/**
+ * drm_framebuffer_read_refcount - read the framebuffer reference count.
+ * @fb: framebuffer
+ *
+ * This functions returns the framebuffer's reference count.
+ */
+static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb)
+{
+	return atomic_read(&fb->refcount.refcount);
+}
+
 /* Plane list iterator for legacy (overlay only) planes. */
 #define drm_for_each_legacy_plane(plane, dev) \
 	list_for_each_entry(plane, &(dev)->mode_config.plane_list, head) \