5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Philip Yang <Philip.Yang@xxxxxxx> [ Upstream commit 6c6064cbe58b43533e3451ad6a8ba9736c109ac3 ] Otherwise after the GTT bo is released, the GTT and gart space is freed but amdgpu_ttm_backend_unbind will not clear the gart page table entry and leave valid mapping entry pointing to the stale system page. Then if GPU access the gart address mistakely, it will read undefined value instead page fault, harder to debug and reproduce the real issue. Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx> Reviewed-by: Christian König <christian.koenig@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index b06fb1fa411b4..9a1b19e3d4378 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -859,6 +859,7 @@ static int amdgpu_ttm_gart_bind(struct amdgpu_device *adev, r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages, gtt->ttm.dma_address, flags); } + gtt->bound = true; gart_bind_fail: if (r) -- 2.43.0
