PCI/ACPI: Check acpi_resource_to_address64() return value

We should check the acpi_resource_to_address64() return value, which
also removes the need to validate the resource type beforehand.
No functional change.

Found by Coverity (CID 113815).

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 1dd6f6c85874..f6c0998f248a 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -100,13 +100,12 @@ get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 {
         struct resource *res = data;
         struct acpi_resource_address64 address;
+        acpi_status status;
 
-        if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
-            resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
-            resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
+        status = acpi_resource_to_address64(resource, &address);
+        if (ACPI_FAILURE(status))
                 return AE_OK;
 
-        acpi_resource_to_address64(resource, &address);
         if ((address.address_length > 0) &&
             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
                 res->start = address.minimum;