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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2010-04-06 13:24:08 -0600 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-04-08 09:23:42 -0700 |
| commit | 73a0e614580fb650846be1e9315f6b7b6069b9cc (patch) | |
| tree | 058e95bd3c0f88eee83f9b1f39afdcdd355392d5 /arch/x86/pci | |
| parent | cf90bfe2ebaf9d32f37acbebb7425c280fd6cd30 (diff) | |
| download | op-kernel-dev-73a0e614580fb650846be1e9315f6b7b6069b9cc.zip op-kernel-dev-73a0e614580fb650846be1e9315f6b7b6069b9cc.tar.gz | |
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>
Diffstat (limited to 'arch/x86/pci')
| -rw-r--r-- | arch/x86/pci/acpi.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index c7b1ebf..334153c 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; |
