For drm_gem_object_unreference callers are required to hold
dev->struct_mutex, which these paths don't. Enforcing this requirement
has become a bit more strict with

commit ef4c6270bf2867e2f8032e9614d1a8cfc6c71663
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Oct 15 09:36:25 2015 +0200

    drm/gem: Check locking in drm_gem_object_unreference

Cc: Dave Airlie <airlied at redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/udl/udl_fb.c  | 2 +-
 drivers/gpu/drm/udl/udl_gem.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 200419d4d43c..18a2acbccb7d 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -538,7 +538,7 @@ static int udlfb_create(struct drm_fb_helper *helper,
 out_destroy_fbi:
        drm_fb_helper_release_fbi(helper);
 out_gfree:
-       drm_gem_object_unreference(&ufbdev->ufb.obj->base);
+       drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
 out:
        return ret;
 }
diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
index 2a0a784ab6ee..d7528e0d8442 100644
--- a/drivers/gpu/drm/udl/udl_gem.c
+++ b/drivers/gpu/drm/udl/udl_gem.c
@@ -52,7 +52,7 @@ udl_gem_create(struct drm_file *file,
                return ret;
        }

-       drm_gem_object_unreference(&obj->base);
+       drm_gem_object_unreference_unlocked(&obj->base);
        *handle_p = handle;
        return 0;
 }
-- 
2.5.1

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