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Thanks for your suggestion, Robin. Do you agree with this as well, Christian and Xinhui?
Regards, Guchun
-----Original Message----- From: Robin Murphy robin.murphy@arm.com Sent: Saturday, September 11, 2021 2:25 AM To: Chen, Guchun Guchun.Chen@amd.com; amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; Koenig, Christian Christian.Koenig@amd.com; Pan, Xinhui Xinhui.Pan@amd.com; Deucher, Alexander Alexander.Deucher@amd.com Cc: Shi, Leslie Yuliang.Shi@amd.com Subject: Re: [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
On 2021-09-10 11:09, Guchun Chen wrote:
Vendor will define their own memory types on top of TTM_PL_PRIV, but call ttm_set_driver_manager directly without checking mem_type value when setting up memory manager. So add such check to aware the case when array bounds.
v2: lower check level to WARN_ON
Signed-off-by: Leslie Shi Yuliang.Shi@amd.com Signed-off-by: Guchun Chen guchun.chen@amd.com
include/drm/ttm/ttm_device.h | 1 + 1 file changed, 1 insertion(+)
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h index 07d722950d5b..aa79953c807c 100644 --- a/include/drm/ttm/ttm_device.h +++ b/include/drm/ttm/ttm_device.h @@ -291,6 +291,7 @@ ttm_manager_type(struct ttm_device *bdev, int mem_type) static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type, struct ttm_resource_manager *manager) {
- WARN_ON(type >= TTM_NUM_MEM_TYPES);
Nit: I know nothing about this code, but from the context alone it would seem sensible to do
if (WARN_ON(type >= TTM_NUM_MEM_TYPES)) return;
to avoid making the subsequent assignment when we *know* it's invalid and likely to corrupt memory.
Robin.
bdev->man_drv[type] = manager; }