PCI: add acpi_find_root_bridge_handle

Consolidate finding of a root bridge and getting its handle to the one
inline function. It's cut & pasted on multiple places. Use this new
inline in those.

Cc: kristen.c.accardi@intel.com
Acked-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

3 files changed, 13 insertions, 10 deletions

diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
index bd831970f00b..e17ef54f0efc 100644
--- a/drivers/pci/hotplug/acpi_pcihp.c
+++ b/drivers/pci/hotplug/acpi_pcihp.c
@@ -404,10 +404,7 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags)
          * OSHP within the scope of the hotplug controller and its parents,
          * upto the host bridge under which this controller exists.
          */
-        while (pdev->bus->self)
-                pdev = pdev->bus->self;
-        handle = acpi_get_pci_rootbridge_handle(pci_domain_nr(pdev->bus),
-                        pdev->bus->number);
+        handle = acpi_find_root_bridge_handle(pdev);
         if (handle) {
                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
                 dbg("Trying to get hotplug control for %s\n",
diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
index 30f581b8791f..6dd7b13e9808 100644
--- a/drivers/pci/pcie/aer/aerdrv_acpi.c
+++ b/drivers/pci/pcie/aer/aerdrv_acpi.c
@@ -36,12 +36,7 @@ int aer_osc_setup(struct pcie_device *pciedev)
         if (acpi_pci_disabled)
                 return -1;
 
-        /* Find root host bridge */
-        while (pdev->bus->self)
-                pdev = pdev->bus->self;
-        handle = acpi_get_pci_rootbridge_handle(
-                pci_domain_nr(pdev->bus), pdev->bus->number);
-
+        handle = acpi_find_root_bridge_handle(pdev);
         if (handle) {
                 pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
                 status = pci_osc_control_set(handle,
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 3ba25065fa96..8837928fbf33 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -57,6 +57,15 @@ static inline acpi_status pcie_osc_support_set(u32 flags)
 {
         return __pci_osc_support_set(flags, PCI_EXPRESS_ROOT_HID_STRING);
 }
+static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
+{
+        /* Find root host bridge */
+        while (pdev->bus->self)
+                pdev = pdev->bus->self;
+
+        return acpi_get_pci_rootbridge_handle(pci_domain_nr(pdev->bus),
+                        pdev->bus->number);
+}
 #else
 #if !defined(AE_ERROR)
 typedef u32             acpi_status;
@@ -66,6 +75,8 @@ static inline acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
 {return AE_ERROR;}
 static inline acpi_status pci_osc_support_set(u32 flags) {return AE_ERROR;} 
 static inline acpi_status pcie_osc_support_set(u32 flags) {return AE_ERROR;}
+static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
+{ return NULL; }
 #endif
 
 #endif  /* _PCI_ACPI_H_ */