[PATCH] drm/amdgpu: workaround for TLB seq race

[Stefan Springer]

Working fine after 26hrs+ of testing, plus another 24hrs of the previous
version of this patch.
Sorry if there are multiple replies, I had to figure out how to properly
reply to a mailing list, such that the reply is picked up by patchwork (1st
time doing this).

Tested-by: Stefan Springer <stefanspr94 at gmail.com>
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