[PATCH] arm64: PCI: Validate the node before setting node id for root bus

[Baolin Wang]

If the BIOS disabled the NUMA configuration, but did not change the
proximity domain description in the SRAT table, so the PCI root bus
device may get a incorrect node id by acpi_get_node().

Thus better to add a numa node validation before setting numa node
for the PCI root bus, like pci_acpi_root_get_node() does for X86
architecture.

Signed-off-by: Baolin Wang <baolin.wang at linux.alibaba.com>
---
 arch/arm64/kernel/pci.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 1006ed2..24fe2bd 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -86,9 +86,13 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 		struct pci_config_window *cfg = bridge->bus->sysdata;
 		struct acpi_device *adev = to_acpi_device(cfg->parent);
 		struct device *bus_dev = &bridge->bus->dev;
+		int node = acpi_get_node(acpi_device_handle(adev));
+
+		if (node != NUMA_NO_NODE && !node_online(node))
+			node = NUMA_NO_NODE;
 
 		ACPI_COMPANION_SET(&bridge->dev, adev);
-		set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
+		set_dev_node(bus_dev, node);
 	}
 
 	return 0;
-- 
1.8.3.1