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

[Alex Deucher]

Applied.  Thanks!

On Mon, Mar 10, 2025 at 2:03 PM Christian König
<christian.koenig at amd.com> wrote:
>
> Am 10.03.25 um 18:08 schrieb Natalie Vock:
> > PRT BOs may not have any backing store, so bo->tbo.resource will be
> > NULL. Check for that before dereferencing.
> >
> > Fixes: 0cce5f285d9ae8 ("drm/amdkfd: Check correct memory types for is_system variable")
> > Signed-off-by: Natalie Vock <natalie.vock at gmx.de>
>
> Reviewed-by: Christian König <christian.koenig at amd.com>
>
> > ---
> >  drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v12_0.c
> > index ea7c32d8380ba..bf8d01da88154 100644
> > --- 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;
> > --
> > 2.48.1
> >
>