https://bugs.freedesktop.org/show_bug.cgi?id=107891

            Bug ID: 107891
           Summary: [wine, regression, bisected] RAGE, Wolfenstein The New
                    Order hangs in menu
           Product: Mesa
           Version: 18.2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: sa@whiz.se
        QA Contact: dri-devel@lists.freedesktop.org

The games RAGE and Wolfenstein The New Order (using Wine) hangs after a short
while in the menu. 

Trying older Mesa releases (and a hacked Wine to work around the need for a
compatibility context) 17.3.9 does not have this issue.

Bisecting lead to 
bc65dcab3bc48673ff6180afb036561a4b8b1119
radeonsi: avoid syncing the driver thread in si_fence_finish
It is really only required when we need to flush for deferred fences.

It's not possibly to revert that commit cleanly on 18.2.0, but moving back "ctx
= threaded_context_unwrap_sync(ctx);" to its original place is enough to get
rid of the hang.

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