drm/ttm: cleanup ttm_tt_(unbind|destroy)

ttm_tt_destroy should be the only one unbinding the object.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_bo.c

@@ -397,7 +397,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 out_err:
 	new_man = &bdev->man[bo->mem.mem_type];
 	if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
-		ttm_tt_unbind(bo->ttm);
 		ttm_tt_destroy(bo->ttm);
 		bo->ttm = NULL;
 	}
@@ -419,7 +418,6 @@ static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 		bo->bdev->driver->move_notify(bo, NULL);
 
 	if (bo->ttm) {
-		ttm_tt_unbind(bo->ttm);
 		ttm_tt_destroy(bo->ttm);
 		bo->ttm = NULL;
 	}

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -53,7 +53,6 @@ int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
 	int ret;
 
 	if (old_mem->mem_type != TTM_PL_SYSTEM) {
-		ttm_tt_unbind(ttm);
 		ttm_bo_free_old_node(bo);
 		ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
 				TTM_PL_MASK_MEM);
@@ -402,7 +401,6 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 	new_mem->mm_node = NULL;
 
 	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
-		ttm_tt_unbind(ttm);
 		ttm_tt_destroy(ttm);
 		bo->ttm = NULL;
 	}
@@ -651,7 +649,6 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
 
 		if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 		    (bo->ttm != NULL)) {
-			ttm_tt_unbind(bo->ttm);
 			ttm_tt_destroy(bo->ttm);
 			bo->ttm = NULL;
 		}

drivers/gpu/drm/ttm/ttm_tt.c

@@ -166,11 +166,15 @@ EXPORT_SYMBOL(ttm_tt_set_placement_caching);
 
 void ttm_tt_destroy(struct ttm_tt *ttm)
 {
+	int ret;
+
 	if (unlikely(ttm == NULL))
 		return;
 
 	if (ttm->state == tt_bound) {
-		ttm_tt_unbind(ttm);
+		ret = ttm->func->unbind(ttm);
+		BUG_ON(ret);
+		ttm->state = tt_unbound;
 	}
 
 	if (ttm->state == tt_unbound)
@@ -251,17 +255,6 @@ void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
 }
 EXPORT_SYMBOL(ttm_dma_tt_fini);
 
-void ttm_tt_unbind(struct ttm_tt *ttm)
-{
-	int ret;
-
-	if (ttm->state == tt_bound) {
-		ret = ttm->func->unbind(ttm);
-		BUG_ON(ret);
-		ttm->state = tt_unbound;
-	}
-}
-
 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 {
 	int ret = 0;

include/drm/ttm/ttm_bo_driver.h

@@ -622,15 +622,6 @@ extern int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
  */
 extern void ttm_tt_destroy(struct ttm_tt *ttm);
 
-/**
- * ttm_ttm_unbind:
- *
- * @ttm: The struct ttm_tt.
- *
- * Unbind a struct ttm_tt.
- */
-extern void ttm_tt_unbind(struct ttm_tt *ttm);
-
 /**
  * ttm_tt_swapin:
  *