[PATCH] drm/amdgpu: add missing NULL check

[Christian König]

Am 06.10.23 um 16:41 schrieb Alex Deucher:
> On Fri, Oct 6, 2023 at 9:07 AM Christian König
> <ckoenig.leichtzumerken at gmail.com> wrote:
>> bo->tbo.resource can easily be NULL here.
>>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
> Add a link to the bug report?

Ah, crap. Forgotten to add the link before pushing that. But I've added 
a CC stable.

Apart from that I suspect that this doesn't fix the real issue here, it 
just mitigates the problem.

For some reason we can't allocate OA resources, but also doesn't fail 
and instead keep working with an empty BO.

Regards,
Christian.

> With that:
> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>> index f3ee83cdf97e..d28e21baef16 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>> @@ -252,7 +252,7 @@ static inline bool amdgpu_bo_in_cpu_visible_vram(struct amdgpu_bo *bo)
>>          struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
>>          struct amdgpu_res_cursor cursor;
>>
>> -       if (bo->tbo.resource->mem_type != TTM_PL_VRAM)
>> +       if (!bo->tbo.resource || bo->tbo.resource->mem_type != TTM_PL_VRAM)
>>                  return false;
>>
>>          amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor);
>> --
>> 2.34.1
>>