dma-buf: finally make dma_resv_excl_fence private v2

Drivers should never touch this directly.

v2: fix rebase clash
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220321135856.1331-10-christian.koenig@amd.comReviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/dma-buf/dma-resv.c

@@ -140,6 +140,12 @@ void dma_resv_fini(struct dma_resv *obj)
 }
 EXPORT_SYMBOL(dma_resv_fini);
 
+static inline struct dma_fence *
+dma_resv_excl_fence(struct dma_resv *obj)
+{
+       return rcu_dereference_check(obj->fence_excl, dma_resv_held(obj));
+}
+
 static inline struct dma_resv_list *dma_resv_shared_list(struct dma_resv *obj)
 {
 	return rcu_dereference_check(obj->fence, dma_resv_held(obj));

include/linux/dma-resv.h

@@ -411,23 +411,6 @@ static inline void dma_resv_unlock(struct dma_resv *obj)
 	ww_mutex_unlock(&obj->lock);
 }
 
-/**
- * dma_resv_excl_fence - return the object's exclusive fence
- * @obj: the reservation object
- *
- * Returns the exclusive fence (if any). Caller must either hold the objects
- * through dma_resv_lock() or the RCU read side lock through rcu_read_lock(),
- * or one of the variants of each
- *
- * RETURNS
- * The exclusive fence or NULL
- */
-static inline struct dma_fence *
-dma_resv_excl_fence(struct dma_resv *obj)
-{
-	return rcu_dereference_check(obj->fence_excl, dma_resv_held(obj));
-}
-
 void dma_resv_init(struct dma_resv *obj);
 void dma_resv_fini(struct dma_resv *obj);
 int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences);