x86/PCI: ignore Consumer/Producer bit in ACPI window descriptions

ACPI Address Space Descriptors (used in _CRS) have a Consumer/Producer
bit that is supposed to distinguish regions that are consumed directly
by a device from those that are forwarded ("produced") by a bridge.
But BIOSes have apparently not used this consistently, and Windows
seems to ignore it, so I think Linux should ignore it as well.

I can't point to any of these supposed broken BIOSes, but since we
now rely on _CRS by default, I think it's safer to ignore this bit
from the start.

Here are details of my experiments with how Windows handles it:
    https://bugzilla.kernel.org/show_bug.cgi?id=15701

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index c7b1ebfb7da7..334153ca4c30 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -71,8 +71,7 @@ resource_to_addr(struct acpi_resource *resource,
         if (ACPI_SUCCESS(status) &&
             (addr->resource_type == ACPI_MEMORY_RANGE ||
             addr->resource_type == ACPI_IO_RANGE) &&
-            addr->address_length > 0 &&
-            addr->producer_consumer == ACPI_PRODUCER) {
+            addr->address_length > 0) {
                 return AE_OK;
         }
         return AE_ERROR;