ACPI / hotplug / PCI: Rework acpiphp_check_host_bridge()

Since the only existing caller of acpiphp_check_host_bridge(),
which is acpi_pci_root_scan_dependent(), already has a struct
acpi_device pointer needed to obtain the ACPIPHP context, it
doesn't make sense to execute acpi_bus_get_device() on its
handle in acpiphp_handle_to_bridge() just in order to get that
pointer back.

For this reason, modify acpiphp_check_host_bridge() to take
a struct acpi_device pointer as its argument and rearrange the
code accordingly.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: NMika Westerberg <mika.westerberg@linux.intel.com>

drivers/acpi/pci_root.c

@@ -51,7 +51,7 @@ static void acpi_pci_root_remove(struct acpi_device *device);
 
 static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
 {
-	acpiphp_check_host_bridge(adev->handle);
+	acpiphp_check_host_bridge(adev);
 	return 0;
 }
 

drivers/pci/hotplug/acpiphp_glue.c

@@ -382,15 +382,11 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
 	return AE_OK;
 }
 
-static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
+static struct acpiphp_bridge *acpiphp_dev_to_bridge(struct acpi_device *adev)
 {
-	struct acpi_device *adev = acpi_bus_get_acpi_device(handle);
 	struct acpiphp_context *context;
 	struct acpiphp_bridge *bridge = NULL;
 
-	if (!adev)
-		return NULL;
-
 	acpi_lock_hp_context();
 	context = acpiphp_get_context(adev);
 	if (context) {
@@ -401,7 +397,6 @@ static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 		acpiphp_put_context(context);
 	}
 	acpi_unlock_hp_context();
-	acpi_bus_put_acpi_device(adev);
 	return bridge;
 }
 
@@ -768,11 +763,11 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
  * ACPI event handlers
  */
 
-void acpiphp_check_host_bridge(acpi_handle handle)
+void acpiphp_check_host_bridge(struct acpi_device *adev)
 {
 	struct acpiphp_bridge *bridge;
 
-	bridge = acpiphp_handle_to_bridge(handle);
+	bridge = acpiphp_dev_to_bridge(adev);
 	if (bridge) {
 		pci_lock_rescan_remove();
 

include/linux/pci-acpi.h

@@ -59,12 +59,12 @@ static inline void acpi_pci_slot_remove(struct pci_bus *bus) { }
 void acpiphp_init(void);
 void acpiphp_enumerate_slots(struct pci_bus *bus);
 void acpiphp_remove_slots(struct pci_bus *bus);
-void acpiphp_check_host_bridge(acpi_handle handle);
+void acpiphp_check_host_bridge(struct acpi_device *adev);
 #else
 static inline void acpiphp_init(void) { }
 static inline void acpiphp_enumerate_slots(struct pci_bus *bus) { }
 static inline void acpiphp_remove_slots(struct pci_bus *bus) { }
-static inline void acpiphp_check_host_bridge(acpi_handle handle) { }
+static inline void acpiphp_check_host_bridge(struct acpi_device *adev) { }
 #endif
 
 #else	/* CONFIG_ACPI */