drm/i915: Protect request retirement with timeline->mutex
Forgo the struct_mutex requirement for request retirement as we have been transitioning over to only using the timeline->mutex for controlling the lifetime of a request on that timeline. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190815205709.24285-4-chris@chris-wilson.co.uk
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