Simply complain if the combined result of start_page and num_pages goes over
the pages bo has. Let me know if the added warning is too heavy a hammer.
Cc: Christian Koenig <christian.koe...@amd.com>
Cc: Huang Rui <ray.hu...@amd.com>
Cc: Junwei Zhang <jerry.zh...@amd.com>
Signed-off-by: Hillf Danton <hdan...@sina.com>
---
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c 2019-04-02 09:27:24.521761100 +0800
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c 2019-04-02 09:37:52.108898500 +0800
@@ -631,6 +631,8 @@ int ttm_bo_kmap(struct ttm_buffer_object
return -EINVAL;
if (start_page > bo->num_pages)
return -EINVAL;
+ if (WARN_ON(start_page > bo->num_pages - num_pages))
+ return -EINVAL;
(void) ttm_mem_io_lock(man, false);
ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
--
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