drm: Drop drm_gem_object_put_locked()

Now that no one is using it, remove it.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20210728010632.2633470-5-robdclark@gmail.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/drm_gem.c

@@ -973,28 +973,6 @@ drm_gem_object_free(struct kref *kref)
 }
 EXPORT_SYMBOL(drm_gem_object_free);
 
-/**
- * drm_gem_object_put_locked - release a GEM buffer object reference
- * @obj: GEM buffer object
- *
- * This releases a reference to @obj. Callers must hold the
- * &drm_device.struct_mutex lock when calling this function, even when the
- * driver doesn't use &drm_device.struct_mutex for anything.
- *
- * For drivers not encumbered with legacy locking use
- * drm_gem_object_put() instead.
- */
-void
-drm_gem_object_put_locked(struct drm_gem_object *obj)
-{
-	if (obj) {
-		WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
-
-		kref_put(&obj->refcount, drm_gem_object_free);
-	}
-}
-EXPORT_SYMBOL(drm_gem_object_put_locked);
-
 /**
  * drm_gem_vm_open - vma->ops->open implementation for GEM
  * @vma: VM area structure

include/drm/drm_gem.h

@@ -384,8 +384,6 @@ drm_gem_object_put(struct drm_gem_object *obj)
 		__drm_gem_object_put(obj);
 }
 
-void drm_gem_object_put_locked(struct drm_gem_object *obj);
-
 int drm_gem_handle_create(struct drm_file *file_priv,
 			  struct drm_gem_object *obj,
 			  u32 *handlep);