[PATCH 4.18 097/235] PCI/AER: Honor "pcie_ports=native" even if HEST sets FIRMWARE_FIRST

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexandru Gagniuc <mr.nuke.me@xxxxxxxxx>

[ Upstream commit 7af02fcd84c16801958936f88b848944c726ca07 ]

According to the documentation, "pcie_ports=native", linux should use
native AER and DPC services.  While that is true for the _OSC method
parsing, this is not the only place that is checked.  Should the HEST
list PCIe ports as firmware-first, linux will not use native services.

This happens because aer_acpi_firmware_first() doesn't take 'pcie_ports'
into account.  This is wrong.  DPC uses the same logic when it decides
whether to load or not, so fixing this also fixes DPC not loading.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@xxxxxxxxx>
[bhelgaas: return "false" from bool function (from kbuild robot)]
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pci/pcie/aer.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -303,6 +303,9 @@ int pcie_aer_get_firmware_first(struct p
 	if (!pci_is_pcie(dev))
 		return 0;
 
+	if (pcie_ports_native)
+		return 0;
+
 	if (!dev->__aer_firmware_first_valid)
 		aer_set_firmware_first(dev);
 	return dev->__aer_firmware_first;
@@ -323,6 +326,9 @@ bool aer_acpi_firmware_first(void)
 		.firmware_first	= 0,
 	};
 
+	if (pcie_ports_native)
+		return false;
+
 	if (!parsed) {
 		apei_hest_parse(aer_hest_parse, &info);
 		aer_firmware_first = info.firmware_first;