Re: [PATCH] drm/amdgpu: fix dropped backing store handling in amdgpu_dma_buf_move_notify

["Deucher, Alexander" <Alexander.Deucher@xxxxxxx>]

[Public]

Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>

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From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
Sent: Friday, December 10, 2021 3:39 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; alexdeucher@xxxxxxxxx <alexdeucher@xxxxxxxxx>
Subject: [PATCH] drm/amdgpu: fix dropped backing store handling in amdgpu_dma_buf_move_notify

 

bo->tbo.resource can now be NULL.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Bug: https://nam11.safelinks.protection.outlook.com/?url="">
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 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index ae6ab93c868b..7444484a12bf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -384,7 +384,7 @@ amdgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
         struct amdgpu_vm_bo_base *bo_base;
         int r;
 
-       if (bo->tbo.resource->mem_type == TTM_PL_SYSTEM)
+       if (!bo->tbo.resource || bo->tbo.resource->mem_type == TTM_PL_SYSTEM)
                 return;
 
         r = ttm_bo_validate(&bo->tbo, &placement, &ctx);
--
2.25.1