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From: Yinghai on 12 Apr 2010 18:50

So make pci root resource from _CRS honor the range We reserve in e820 below 1M
then will not assign them to unsigned pci BAR

-v2: let pci_bus_alloc_resource() honor IORESOURCE_BUSY
driver can not use those range, so skip it

Tested-by: Andy Isaacson <adi(a)hexapodia.org>
Cc: Bjorn Helgaas <bjorn.helgaas(a)hp.com>
Signed-off-by: Yinghai Lu <yinghai(a)kernel.org>

---
arch/x86/pci/acpi.c | 4 ++++
drivers/pci/bus.c | 4 ++++
2 files changed, 8 insertions(+)

Index: linux-2.6/arch/x86/pci/acpi.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/acpi.c
+++ linux-2.6/arch/x86/pci/acpi.c
@@ -175,6 +175,10 @@ setup_resource(struct acpi_resource *acp
"conflicts with %s %pR\n",
res, conflict->name, conflict);
} else {
+ /* In case it falls in big reserved region */
+ if (res->parent->flags & IORESOURCE_BUSY)
+ res->flags |= IORESOURCE_BUSY;
+
pci_bus_add_resource(info->bus, res, 0);
info->res_num++;
if (addr.translation_offset)
Index: linux-2.6/drivers/pci/bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/bus.c
+++ linux-2.6/drivers/pci/bus.c
@@ -103,6 +103,10 @@ pci_bus_alloc_resource(struct pci_bus *b
if (!r)
continue;

+ /* Driver can not reserve it later, so don't use it */
+ if (r->flags & IORESOURCE_BUSY)
+ continue;
+
/* type_mask must match */
if ((res->flags ^ r->flags) & type_mask)
continue;
--
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