[PATCH v4 2/2] x86/PCI: Fix a potential regression when use dmi_get_bios_year()

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

dmi_get_bios_year() may return 0 when it is incapable to parse
the BIOS date string. Previously this has been checked in
pci_acpi_crs_quirks().

Update the code to restore old behaviour.

Fixes: 69c42d493db4 ("x86/pci: Simplify code by using the new dmi_get_bios_year() helper")
Reported-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 arch/x86/pci/acpi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 00e60de30328..5559dcaddd5e 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -140,7 +140,9 @@ static const struct dmi_system_id pci_crs_quirks[] __initconst = {
 
 void __init pci_acpi_crs_quirks(void)
 {
-	if ((dmi_get_bios_year() < 2008) && (iomem_resource.end <= 0xffffffff))
+	int year = dmi_get_bios_year();
+
+	if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff)
 		pci_use_crs = false;
 
 	dmi_check_system(pci_crs_quirks);
-- 
2.16.2