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Every time a graph object is added or removed, the version of the topology changes. That's a requirement for the new MEDIA_IOC_G_TOPOLOGY, in order to allow userspace to know that the topology has changed after a previous call to it. Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>