This partially revertsd340bdd1bd. The function previously drops multiple except for the last parents which matches the specified subsystem. But the commitd340bdd1bddrops all parents. E.g. input is pci-pci-pci-usb-usb-usb, then Befored340bdd: pci-pci-pci-usb Afterd340bdd: pci-pci-pci
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