From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Date: Fri, 19 Jun 2020 08:20:05 +0000 (+0100)
Subject: ACPI/IORT: Remove useless PCI bus walk
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3a3d208beede7ae03f8c80bed01f47d6b98d4ceb;p=linux.git

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>
---

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 53f9ef5150896..421c6976ab819 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/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);