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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-03-20 19:08:00 +0100
committerIngo Molnar <mingo@kernel.org>2018-03-27 11:33:16 +0200
commit47a9973d3ed8994589c845c8b1a293a475a549a9 (patch)
tree7b9dff2af962ceb405d66a134075f29020379ba6 /arch
parentfirmware/dmi_scan: Uninline dmi_get_bios_year() helper (diff)
downloadlinux-47a9973d3ed8994589c845c8b1a293a475a549a9.tar.xz
linux-47a9973d3ed8994589c845c8b1a293a475a549a9.zip
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@suse.de> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lukas Wunner <lukas@wunner.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J . Wysocki <rjw@rjwysocki.net> Cc: linux-acpi@vger.kernel.org Cc: linux-pci@vger.kernel.org Fixes: 69c42d493db4 ("x86/pci: Simplify code by using the new dmi_get_bios_year() helper") Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/pci/acpi.c4
1 files changed, 3 insertions, 1 deletions
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);