ACPI: pci_root: use driver data rather than list lookup

There's no need to search the list to find the acpi_pci_root
structure.  We saved it as device->driver_data when we added
the device.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 4 insertions, 17 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 0d69c0348c58..7984e00540fa 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -497,30 +497,17 @@ end:
 
 static int acpi_pci_root_start(struct acpi_device *device)
 {
-        struct acpi_pci_root *root;
-
+        struct acpi_pci_root *root = acpi_driver_data(device);
 
-        list_for_each_entry(root, &acpi_pci_roots, node) {
-                if (root->device == device) {
-                        pci_bus_add_devices(root->bus);
-                        return 0;
-                }
-        }
-        return -ENODEV;
+        pci_bus_add_devices(root->bus);
+        return 0;
 }
 
 static int acpi_pci_root_remove(struct acpi_device *device, int type)
 {
-        struct acpi_pci_root *root = NULL;
-
-
-        if (!device || !acpi_driver_data(device))
-                return -EINVAL;
-
-        root = acpi_driver_data(device);
+        struct acpi_pci_root *root = acpi_driver_data(device);
 
         kfree(root);
-
         return 0;
 }