drm/amdgpu: fix initializing the VM last eviction counter

Close a very small window where something can go wrong.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1629,13 +1629,17 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 		goto error_free_page_directory;
 
 	r = amdgpu_vm_clear_bo(adev, vm, vm->page_directory);
-	amdgpu_bo_unreserve(vm->page_directory);
 	if (r)
-		goto error_free_page_directory;
+		goto error_unreserve;
+
 	vm->last_eviction_counter = atomic64_read(&adev->num_evictions);
+	amdgpu_bo_unreserve(vm->page_directory);
 
 	return 0;
 
+error_unreserve:
+	amdgpu_bo_unreserve(vm->page_directory);
+
 error_free_page_directory:
 	amdgpu_bo_unref(&vm->page_directory->shadow);
 	amdgpu_bo_unref(&vm->page_directory);