drm/amdgpu: NULL-check BO's backing store when determining GFX12 PTE flags

PRT BOs may not have any backing store, so bo->tbo.resource will be
NULL. Check for that before dereferencing.

Fixes: 0cce5f285d9a ("drm/amdkfd: Check correct memory types for is_system variable")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Natalie Vock <natalie.vock@gmx.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 3e3fcd29b505cebed659311337ea03b7698767fc)
Cc: stable@vger.kernel.org # 6.12.x

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c
index b749f1c3f6a9afb65634ed118f4734438df11877..0fb88e6d5d54b3cc1bcc41caeb7cbd0e9e3d92b5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c
@@ -528,8 +528,9 @@ static void gmc_v12_0_get_vm_pte(struct amdgpu_device *adev,
 
        bo_adev = amdgpu_ttm_adev(bo->tbo.bdev);
        coherent = bo->flags & AMDGPU_GEM_CREATE_COHERENT;
-       is_system = (bo->tbo.resource->mem_type == TTM_PL_TT) ||
-               (bo->tbo.resource->mem_type == AMDGPU_PL_PREEMPT);
+       is_system = bo->tbo.resource &&
+               (bo->tbo.resource->mem_type == TTM_PL_TT ||
+                bo->tbo.resource->mem_type == AMDGPU_PL_PREEMPT);
 
        if (bo && bo->flags & AMDGPU_GEM_CREATE_GFX12_DCC)
                *flags |= AMDGPU_PTE_DCC;