+static void __init css_bus_cleanup(void)
+{
+ struct channel_subsystem *css;
+ int i;
+
+ for (i = 0; i <= __MAX_CSSID; i++) {
+ css = channel_subsystems[i];
+ device_unregister(&css->pseudo_subchannel->dev);
+ css->pseudo_subchannel = NULL;
+ if (css_chsc_characteristics.secm)
+ device_remove_file(&css->device, &dev_attr_cm_enable);
+ device_unregister(&css->device);
+ }
+ bus_unregister(&css_bus_type);
+ crw_unregister_handler(CRW_RSC_CSS);
+ chsc_free_sei_area();
+ idset_free(slow_subchannel_set);
+ isc_unregister(IO_SCH_ISC);
+}
+
+static int __init channel_subsystem_init(void)
+{
+ int ret;
+
+ ret = css_bus_init();
+ if (ret)
+ return ret;
+ cio_work_q = create_singlethread_workqueue("cio");
+ if (!cio_work_q) {
+ ret = -ENOMEM;
+ goto out_bus;
+ }
+ ret = io_subchannel_init();
+ if (ret)
+ goto out_wq;
+
+ return ret;
+out_wq:
+ destroy_workqueue(cio_work_q);
+out_bus:
+ css_bus_cleanup();
+ return ret;
+}
+subsys_initcall(channel_subsystem_init);
+
+static int css_settle(struct device_driver *drv, void *unused)
+{
+ struct css_driver *cssdrv = to_cssdriver(drv);
+
+ if (cssdrv->settle)
+ return cssdrv->settle();
+ return 0;
+}
+
+int css_complete_work(void)
+{
+ int ret;
+
+ /* Wait for the evaluation of subchannels to finish. */
+ ret = wait_event_interruptible(css_eval_wq,
+ atomic_read(&css_eval_scheduled) == 0);
+ if (ret)
+ return -EINTR;
+ flush_workqueue(cio_work_q);
+ /* Wait for the subchannel type specific initialization to finish */
+ return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
+}
+
+
+/*
+ * Wait for the initialization of devices to finish, to make sure we are
+ * done with our setup if the search for the root device starts.
+ */
+static int __init channel_subsystem_init_sync(void)
+{
+ /* Start initial subchannel evaluation. */
+ css_schedule_eval_all();
+ css_complete_work();
+ return 0;
+}
+subsys_initcall_sync(channel_subsystem_init_sync);
+
+void channel_subsystem_reinit(void)
+{
+ chsc_enable_facility(CHSC_SDA_OC_MSS);
+}
+
+#ifdef CONFIG_PROC_FS
+static ssize_t cio_settle_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int ret;
+
+ /* Handle pending CRW's. */
+ crw_wait_for_channel_report();
+ ret = css_complete_work();
+
+ return ret ? ret : count;
+}
+
+static const struct file_operations cio_settle_proc_fops = {
+ .write = cio_settle_write,
+};
+
+static int __init cio_settle_init(void)
+{
+ struct proc_dir_entry *entry;
+
+ entry = proc_create("cio_settle", S_IWUSR, NULL,
+ &cio_settle_proc_fops);
+ if (!entry)
+ return -ENOMEM;
+ return 0;
+}
+device_initcall(cio_settle_init);
+#endif /*CONFIG_PROC_FS*/
+