1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_cursor.c b/drivers/gpu/drm/radeon/radeon_cursor.c
index ad6df625e8b8..c1680e6d76ad 100644
--- a/drivers/gpu/drm/radeon/radeon_cursor.c
+++ b/drivers/gpu/drm/radeon/radeon_cursor.c
@@ -245,8 +245,14 @@ int radeon_crtc_cursor_move(struct drm_crtc *crtc,
                 int i = 0;
                 struct drm_crtc *crtc_p;
 
-                /* avivo cursor image can't end on 128 pixel boundary or
+                /*
+                 * avivo cursor image can't end on 128 pixel boundary or
                  * go past the end of the frame if both crtcs are enabled
+                 *
+                 * NOTE: It is safe to access crtc->enabled of other crtcs
+                 * without holding either the mode_config lock or the other
+                 * crtc's lock as long as write access to this flag _always_
+                 * grabs all locks.
                  */
                 list_for_each_entry(crtc_p, &crtc->dev->mode_config.crtc_list, head) {
                         if (crtc_p->enabled)