drm/amdgpu: remove excl as shared workarounds

This was added because of the now dropped shared on excl dependency.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20211123142111.3885-15-christian.koenig@amd.com

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -1275,14 +1275,11 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
 		/*
 		 * Work around dma_resv shortcommings by wrapping up the
 		 * submission in a dma_fence_chain and add it as exclusive
-		 * fence, but first add the submission as shared fence to make
-		 * sure that shared fences never signal before the exclusive
-		 * one.
+		 * fence.
 		 */
 		dma_fence_chain_init(chain, dma_resv_excl_fence(resv),
 				     dma_fence_get(p->fence), 1);
 
-		dma_resv_add_shared_fence(resv, p->fence);
 		rcu_assign_pointer(resv->fence_excl, &chain->base);
 		e->chain = NULL;
 	}

drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c

@@ -226,12 +226,6 @@ static void amdgpu_gem_object_close(struct drm_gem_object *obj,
 	if (!amdgpu_vm_ready(vm))
 		goto out_unlock;
 
-	fence = dma_resv_excl_fence(bo->tbo.base.resv);
-	if (fence) {
-		amdgpu_bo_fence(bo, fence, true);
-		fence = NULL;
-	}
-
 	r = amdgpu_vm_clear_freed(adev, vm, &fence);
 	if (r || !fence)
 		goto out_unlock;