[PATCH xserver 1/2] modesetting: Fix reverse prime partial update issues on secondary GPU outputs

[Keith Packard]

Hans de Goede <hdegoede at redhat.com> writes:

> So it looks like we really need glFinish to ensure proper ordering here
> (and I've just deleted the v2 of this patchset with flush with I had
> prepared).

If you need glFinish, then your drivers are broken. glFlush and suitable
fences provides sufficient information to allow for synchronization
between operations without also requiring waiting for the hardware to
finish. It's a difference between getting things into the hardware
queues in the right order and waiting for those hardware queues to
drain.

-- 
-keith
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