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The lessor is invariant over a lifetime of a lease, we don't have to grab any locks for that. Speeds up the common case of not being a lease. Cc: Keith Packard <keithp@keithp.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20190228144910.26488-5-daniel.vetter@ffwll.ch