1 files changed, 27 insertions, 8 deletions

diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 6bf48d7842c6..017cfc3f4789 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -168,6 +168,29 @@ add_io_space (struct acpi_resource_address64 *addr)
         return IO_SPACE_BASE(i);
 }
 
+static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
+        struct acpi_resource_address64 *addr)
+{
+        acpi_status status;
+
+        /*
+         * We're only interested in _CRS descriptors that are
+         *      - address space descriptors for memory or I/O space
+         *      - non-zero size
+         *      - producers, i.e., the address space is routed downstream,
+         *        not consumed by the bridge itself
+         */
+        status = acpi_resource_to_address64(resource, addr);
+        if (ACPI_SUCCESS(status) &&
+            (addr->resource_type == ACPI_MEMORY_RANGE ||
+             addr->resource_type == ACPI_IO_RANGE) &&
+            addr->address_length &&
+            addr->producer_consumer == ACPI_PRODUCER)
+                return AE_OK;
+
+        return AE_ERROR;
+}
+
 static acpi_status __devinit
 count_window (struct acpi_resource *resource, void *data)
 {
@@ -175,11 +198,9 @@ count_window (struct acpi_resource *resource, void *data)
         struct acpi_resource_address64 addr;
         acpi_status status;
 
-        status = acpi_resource_to_address64(resource, &addr);
+        status = resource_to_window(resource, &addr);
         if (ACPI_SUCCESS(status))
-                if (addr.resource_type == ACPI_MEMORY_RANGE ||
-                    addr.resource_type == ACPI_IO_RANGE)
-                        (*windows)++;
+                (*windows)++;
 
         return AE_OK;
 }
@@ -198,13 +219,11 @@ static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
         unsigned long flags, offset = 0;
         struct resource *root;
 
-        status = acpi_resource_to_address64(res, &addr);
+        /* Return AE_OK for non-window resources to keep scanning for more */
+        status = resource_to_window(res, &addr);
         if (!ACPI_SUCCESS(status))
                 return AE_OK;
 
-        if (!addr.address_length)
-                return AE_OK;
-
         if (addr.resource_type == ACPI_MEMORY_RANGE) {
                 flags = IORESOURCE_MEM;
                 root = &iomem_resource;