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authorBjorn Helgaas <bjorn.helgaas@hp.com>2010-04-06 13:24:08 -0600
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-04-08 09:23:42 -0700
commit73a0e614580fb650846be1e9315f6b7b6069b9cc (patch)
tree058e95bd3c0f88eee83f9b1f39afdcdd355392d5 /arch/x86/pci
parentcf90bfe2ebaf9d32f37acbebb7425c280fd6cd30 (diff)
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.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index c7b1ebfb7da..334153ca4c3 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;