[PATCH 3/3] x86,pci,acpi: Handle invalid _CRS

[Yinghai]

Don't clear root bus resource too early, until We can make sure _CRS works

also restore it, if all _CRS get rejected because of conflicts

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>

---
 arch/x86/pci/acpi.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

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
@@ -196,9 +196,6 @@ get_current_resources(struct acpi_device
 	struct pci_root_info info;
 	size_t size;
 
-	if (pci_use_crs)
-		pci_bus_remove_resources(bus);
-
 	info.bridge = device;
 	info.bus = bus;
 	info.res_num = 0;
@@ -217,10 +214,20 @@ get_current_resources(struct acpi_device
 		goto name_alloc_fail;
 	sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
 
+	/* Only clear that when _CRS works for sure*/
+	if (pci_use_crs)
+		pci_bus_remove_resources(bus);
+
 	info.res_num = 0;
 	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 				&info);
 
+	if (pci_use_crs && !info.res_num) {
+		/* Restore default one */
+		bus->resource[0] = &ioport_resource;
+		bus->resource[1] = &iomem_resource;
+	}
+
 	return;
 
 name_alloc_fail:
--
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