ACPI/IORT: Remove useless PCI bus walk

The PCI bus domain number (used in the iort_match_node_callback() -
pci_domain_nr() call) is cascaded through the PCI bus hierarchy at PCI
bus enumeration time, therefore there is no need in iort_find_dev_node()
to walk the PCI bus upwards to grab the root bus to be passed to
iort_scan_node(), the device->bus PCI bus pointer will do.

Remove this useless code.

Signed-off-by: Lorenzo Pieralisi <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Hanjun Guo <[email protected]>
Cc: Sudeep Holla <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

Author: Lorenzo Pieralisi

drivers/acpi/arm64/iort.c

@@ -558,10 +558,7 @@ static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
 				      iort_match_node_callback, dev);
 	}
 
-	/* Find a PCI root bus */
 	pbus = to_pci_dev(dev)->bus;
-	while (!pci_is_root_bus(pbus))
-		pbus = pbus->parent;
 
 	return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
 			      iort_match_node_callback, &pbus->dev);