loader/dri3: Only wait for back buffer fences in dri3_get_buffer
We don't need to wait before drawing to the fake front buffer, as front buffer rendering by definition is allowed to produce artifacts. Fixes hangs in some cases when re-using the fake front buffer, due to it still being busy (i.e. in use for presentation). Cc: mesa-stable@lists.freedesktop.org Bugzilla: https://bugs.freedesktop.org/106404 Bugzilla: https://bugs.freedesktop.org/107757 Tested-by:Olivier Fourdan <ofourdan@redhat.com> Reviewed-by:
Thomas Hellstrom <thellstrom@vmware.com>
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