PCI/ACPI: Use acpi_driver_data() rather than searching acpi_pci_roots

This patch changes the implementation of acpi_pci_find_root().

We can access acpi_pci_root without scanning acpi_pci_roots list.
If hostbridge hotplug is supported, acpi_pci_roots list will be
protected by mutex.  We should not access acpi_pci_roots list
if preventable to lessen deadlock risk.

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index e1bdcc700cb..13f9b5ba335 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -270,12 +270,15 @@ static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 {
         struct acpi_pci_root *root;
+        struct acpi_device *device;
 
-        list_for_each_entry(root, &acpi_pci_roots, node) {
-                if (root->device->handle == handle)
-                        return root;
-        }
-        return NULL;
+        if (acpi_bus_get_device(handle, &device) ||
+            acpi_match_device_ids(device, root_device_ids))
+                return NULL;
+
+        root = acpi_driver_data(device);
+
+        return root;
 }
 EXPORT_SYMBOL_GPL(acpi_pci_find_root);