ACPI / PCI: Make bus registration and unregistration symmetric

Since acpi_pci_slot_enumerate() and acpiphp_enumerate_slots() can get
the ACPI device handle they need from bus->bridge, it is not
necessary to pass that handle to them as an argument.

Drop the second argument of acpi_pci_slot_enumerate() and
acpiphp_enumerate_slots(), rework them to obtain the ACPI handle
from bus->bridge and make acpi_pci_add_bus() and
acpi_pci_remove_bus() entirely symmetrical.

Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>

drivers/acpi/pci_slot.c

@@ -159,12 +159,16 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 	return AE_OK;
 }
 
-void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle)
+void acpi_pci_slot_enumerate(struct pci_bus *bus)
 {
-	mutex_lock(&slot_list_lock);
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
-			    register_slot, NULL, bus, NULL);
-	mutex_unlock(&slot_list_lock);
+	acpi_handle handle = ACPI_HANDLE(bus->bridge);
+
+	if (handle) {
+		mutex_lock(&slot_list_lock);
+		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+				    register_slot, NULL, bus, NULL);
+		mutex_unlock(&slot_list_lock);
+	}
 }
 
 void acpi_pci_slot_remove(struct pci_bus *bus)

drivers/pci/hotplug/acpiphp_glue.c

@@ -1147,14 +1147,16 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type,
  * Create hotplug slots for the PCI bus.
  * It should always return 0 to avoid skipping following notifiers.
  */
-void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle)
+void acpiphp_enumerate_slots(struct pci_bus *bus)
 {
+	acpi_handle handle;
 	struct acpiphp_bridge *bridge;
 
 	if (acpiphp_disabled)
 		return;
 
-	if (detect_ejectable_slots(handle) <= 0)
+	handle = ACPI_HANDLE(bus->bridge);
+	if (!handle || detect_ejectable_slots(handle) <= 0)
 		return;
 
 	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);

drivers/pci/pci-acpi.c

@@ -290,24 +290,16 @@ static struct pci_platform_pm_ops acpi_pci_platform_pm = {
 
 void acpi_pci_add_bus(struct pci_bus *bus)
 {
-	acpi_handle handle = NULL;
-
-	if (bus->bridge)
-		handle = ACPI_HANDLE(bus->bridge);
-	if (acpi_pci_disabled || handle == NULL)
+	if (acpi_pci_disabled || !bus->bridge)
 		return;
 
-	acpi_pci_slot_enumerate(bus, handle);
-	acpiphp_enumerate_slots(bus, handle);
+	acpi_pci_slot_enumerate(bus);
+	acpiphp_enumerate_slots(bus);
 }
 
 void acpi_pci_remove_bus(struct pci_bus *bus)
 {
-	/*
-	 * bus->bridge->acpi_node.handle has already been reset to NULL
-	 * when acpi_pci_remove_bus() is called, so don't check ACPI handle.
-	 */
-	if (acpi_pci_disabled)
+	if (acpi_pci_disabled || !bus->bridge)
 		return;
 
 	acpiphp_remove_slots(bus);

include/linux/pci-acpi.h

@@ -47,24 +47,22 @@ void acpi_pci_remove_bus(struct pci_bus *bus);
 
 #ifdef	CONFIG_ACPI_PCI_SLOT
 void acpi_pci_slot_init(void);
-void acpi_pci_slot_enumerate(struct pci_bus *bus, acpi_handle handle);
+void acpi_pci_slot_enumerate(struct pci_bus *bus);
 void acpi_pci_slot_remove(struct pci_bus *bus);
 #else
 static inline void acpi_pci_slot_init(void) { }
-static inline void acpi_pci_slot_enumerate(struct pci_bus *bus,
-					   acpi_handle handle) { }
+static inline void acpi_pci_slot_enumerate(struct pci_bus *bus) { }
 static inline void acpi_pci_slot_remove(struct pci_bus *bus) { }
 #endif
 
 #ifdef	CONFIG_HOTPLUG_PCI_ACPI
 void acpiphp_init(void);
-void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle);
+void acpiphp_enumerate_slots(struct pci_bus *bus);
 void acpiphp_remove_slots(struct pci_bus *bus);
 void acpiphp_check_host_bridge(acpi_handle handle);
 #else
 static inline void acpiphp_init(void) { }
-static inline void acpiphp_enumerate_slots(struct pci_bus *bus,
-					   acpi_handle handle) { }
+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) { }
 #endif