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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 <lorenzo.pieralisi@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Link: https://lore.kernel.org/r/20200619082013.13661-5-lorenzo.pieralisi@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Lorenzo Pieralisi 2020-06-19 09:20:05 +01:00 committed by Catalin Marinas
parent 39c3cf566c
commit 3a3d208bee
1 changed files with 0 additions and 3 deletions
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3
drivers/acpi/arm64/iort.c
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@ -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);