ACPI / hotplug: Carry out PCI root eject directly

Since _handle_hotplug_event_root() is run from the ACPI hotplug
workqueue, it doesn't need to queue up a work item to eject a PCI
host bridge on the same workqueue.  Instead, it can just carry out
the eject by calling acpi_bus_device_eject() directly, so make that
happen.
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/internal.h

@@ -87,7 +87,7 @@ void acpi_device_add_finalize(struct acpi_device *device);
 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);
 int acpi_bind_one(struct device *dev, acpi_handle handle);
 int acpi_unbind_one(struct device *dev);
-void acpi_bus_hot_remove_device(void *context);
+void acpi_bus_device_eject(struct acpi_device *device, u32 ost_src);
 
 /* --------------------------------------------------------------------------
                                   Power Resource

drivers/acpi/pci_root.c

@@ -592,16 +592,6 @@ static void handle_root_bridge_insertion(acpi_handle handle)
 		acpi_handle_err(handle, "cannot add bridge to acpi list\n");
 }
 
-static void handle_root_bridge_removal(struct acpi_device *device)
-{
-	acpi_status status;
-
-	get_device(&device->dev);
-	status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, device);
-	if (ACPI_FAILURE(status))
-		put_device(&device->dev);
-}
-
 static void _handle_hotplug_event_root(struct work_struct *work)
 {
 	struct acpi_pci_root *root;
@@ -612,6 +602,7 @@ static void _handle_hotplug_event_root(struct work_struct *work)
 	hp_work = container_of(work, struct acpi_hp_work, work);
 	handle = hp_work->handle;
 	type = hp_work->type;
+	kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
 
 	acpi_scan_lock_acquire();
 
@@ -641,9 +632,15 @@ static void _handle_hotplug_event_root(struct work_struct *work)
 		/* request device eject */
 		acpi_handle_printk(KERN_DEBUG, handle,
 				   "Device eject notify on %s\n", __func__);
-		if (root)
-			handle_root_bridge_removal(root->device);
+		if (!root)
 			break;
+
+		get_device(&root->device->dev);
+
+		acpi_scan_lock_release();
+
+		acpi_bus_device_eject(root->device, ACPI_NOTIFY_EJECT_REQUEST);
+		return;
 	default:
 		acpi_handle_warn(handle,
 				 "notify_handler: unknown event type 0x%x\n",
@@ -652,7 +649,6 @@ static void _handle_hotplug_event_root(struct work_struct *work)
 	}
 
 	acpi_scan_lock_release();
-	kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
 }
 
 static void handle_hotplug_event_root(acpi_handle handle, u32 type,

drivers/acpi/scan.c

@@ -285,7 +285,7 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
 	return 0;
 }
 
-static void acpi_bus_device_eject(struct acpi_device *device, u32 ost_src)
+void acpi_bus_device_eject(struct acpi_device *device, u32 ost_src)
 {
 	acpi_handle handle = device->handle;
 	struct acpi_scan_handler *handler;
@@ -409,7 +409,7 @@ static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
  * acpi_bus_hot_remove_device: Hot-remove a device and its children.
  * @context: Address of the ACPI device object to hot-remove.
  */
-void acpi_bus_hot_remove_device(void *context)
+static void acpi_bus_hot_remove_device(void *context)
 {
 	acpi_bus_device_eject(context, ACPI_NOTIFY_EJECT_REQUEST);
 }