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pci/pcie_port: Add pci_find_port_by_pn()
Simple function to search a PCIBus to find a port by it's port number. CXL interleave decoding uses the port number as a target so it is necessary to locate the port when doing interleave decoding. Signed-off-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20220429144110.25167-31-Jonathan.Cameron@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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