Fixing SDMA TO after GPU reset

[Christian König]

It would probably be better to initialize job->vm_pd_addr with 
AMDGPU_BO_INVALID_OFFSET.

And then just drop the vm flush alltogether when the vm_pd_addr isn't 
set to something sane.

Thanks,
Christian.

Am 11.09.2018 um 00:52 schrieb Andrey Grodzovsky:
> Attached patch fixes SDMA TO after GPU reset, it's a regression caused 
> by cbd5285 drm/amdgpu: move setting the GART addr into TTM.
>
> But to me it looks safer just to revert the original patch all 
> together since we never can predict for sure if VM flush will take 
> place and so it's safer to just always assign job->vm_pd_addr.
>
> Andrey
>
>
>
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