Comment # 7 on bug 102616 from Chris Wilson

commit 92e457d0ffe930369d09bc83d3d3ed90c9bd6cb1
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Sep 8 11:33:15 2017 +0100

    igt/gem_eio: inflight wedged requires long plugging

    As our hangcheck may exceed 10s to declare the device wedged, we need to
    hold the plugging fence indefinitely. This makes using vgem as our input
    fence unusable, so resort to using sw_sync. At the same time, we can
    then check that the async result is also -EIO.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102616
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>