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Function dmar_parse_dev_scope() should release the PCI device reference count gained in function dmar_parse_one_dev_scope() on error recovery, otherwise it will cause PCI device object leakage. This patch also introduces dmar_free_dev_scope(), which will be used to support DMAR device hotplug. Reviewed-by: Yijing Wang <wangyijing@huawei.com> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>