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Drivers using their own implementation of io_mem_reserve/io_mem_free are likely to store the tracking information for the map in mem.mm_node, so it can't be freed while still mapped. Signed-off-by: Ben Skeggs<bskeggs@redhat.com> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>