Commit-ID: 47a9973d3ed8994589c845c8b1a293a475a549a9
Gitweb: https://git.kernel.org/tip/47a9973d3ed8994589c845c8b1a293a475a549a9
Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
AuthorDate: Tue, 20 Mar 2018 20:08:00 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 27 Mar 2018 11:33:16 +0200
x86/PCI: Fix a potential regression when using dmi_get_bios_year()
dmi_get_bios_year() may return 0 when it cannot parse
the BIOS date string. Previously this has been checked in
pci_acpi_crs_quirks().
Update the code to restore old behaviour.
Reported-by: Jean Delvare <jdelvare@xxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Lukas Wunner <lukas@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rafael J . Wysocki <rjw@xxxxxxxxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
Fixes: 69c42d493db4 ("x86/pci: Simplify code by using the new dmi_get_bios_year() helper")
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
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);
--
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