s390/dasd: remove unused pm related functions

The power-management related functions are unused since the
'commit 39421627 ("s390: remove broken hibernate / power management
support")'. Remove them from dasd drivers.
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/block/dasd.c

@@ -75,7 +75,6 @@ static int dasd_flush_block_queue(struct dasd_block *);
 static void dasd_device_tasklet(unsigned long);
 static void dasd_block_tasklet(unsigned long);
 static void do_kick_device(struct work_struct *);
-static void do_restore_device(struct work_struct *);
 static void do_reload_device(struct work_struct *);
 static void do_requeue_requests(struct work_struct *);
 static void dasd_return_cqr_cb(struct dasd_ccw_req *, void *);
@@ -138,7 +137,6 @@ struct dasd_device *dasd_alloc_device(void)
 	INIT_LIST_HEAD(&device->ccw_queue);
 	timer_setup(&device->timer, dasd_device_timeout, 0);
 	INIT_WORK(&device->kick_work, do_kick_device);
-	INIT_WORK(&device->restore_device, do_restore_device);
 	INIT_WORK(&device->reload_device, do_reload_device);
 	INIT_WORK(&device->requeue_requests, do_requeue_requests);
 	device->state = DASD_STATE_NEW;
@@ -620,26 +618,6 @@ void dasd_reload_device(struct dasd_device *device)
 }
 EXPORT_SYMBOL(dasd_reload_device);
 
-/*
- * dasd_restore_device will schedule a call do do_restore_device to the kernel
- * event daemon.
- */
-static void do_restore_device(struct work_struct *work)
-{
-	struct dasd_device *device = container_of(work, struct dasd_device,
-						  restore_device);
-	device->cdev->drv->restore(device->cdev);
-	dasd_put_device(device);
-}
-
-void dasd_restore_device(struct dasd_device *device)
-{
-	dasd_get_device(device);
-	/* queue call to dasd_restore_device to the kernel event daemon. */
-	if (!schedule_work(&device->restore_device))
-		dasd_put_device(device);
-}
-
 /*
  * Set the target state for a device and starts the state change.
  */
@@ -1514,7 +1492,6 @@ int dasd_start_IO(struct dasd_ccw_req *cqr)
 			      "start_IO: -EIO device gone, retry");
 		break;
 	case -EINVAL:
-		/* most likely caused in power management context */
 		DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 			      "start_IO: -EINVAL device currently "
 			      "not accessible");
@@ -2048,7 +2025,7 @@ static void __dasd_device_check_expire(struct dasd_device *device)
 static int __dasd_device_is_unusable(struct dasd_device *device,
 				     struct dasd_ccw_req *cqr)
 {
-	int mask = ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM | DASD_STOPPED_NOSPC);
+	int mask = ~(DASD_STOPPED_DC_WAIT | DASD_STOPPED_NOSPC);
 
 	if (test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
 	    !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
@@ -2112,8 +2089,7 @@ static void __dasd_device_check_path_events(struct dasd_device *device)
 	if (!dasd_path_get_tbvpm(device))
 		return;
 
-	if (device->stopped &
-	    ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
+	if (device->stopped & ~(DASD_STOPPED_DC_WAIT))
 		return;
 	rc = device->discipline->verify_path(device,
 					     dasd_path_get_tbvpm(device));
@@ -3788,11 +3764,6 @@ int dasd_generic_path_operational(struct dasd_device *device)
 		 "operational\n");
 	DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
 	dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
-	if (device->stopped & DASD_UNRESUMED_PM) {
-		dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
-		dasd_restore_device(device);
-		return 1;
-	}
 	dasd_schedule_device_bh(device);
 	if (device->block) {
 		dasd_schedule_block_bh(device->block);
@@ -4052,66 +4023,6 @@ void dasd_schedule_requeue(struct dasd_device *device)
 }
 EXPORT_SYMBOL(dasd_schedule_requeue);
 
-int dasd_generic_pm_freeze(struct ccw_device *cdev)
-{
-	struct dasd_device *device = dasd_device_from_cdev(cdev);
-
-	if (IS_ERR(device))
-		return PTR_ERR(device);
-
-	/* mark device as suspended */
-	set_bit(DASD_FLAG_SUSPENDED, &device->flags);
-
-	if (device->discipline->freeze)
-		device->discipline->freeze(device);
-
-	/* disallow new I/O  */
-	dasd_device_set_stop_bits(device, DASD_STOPPED_PM);
-
-	return dasd_generic_requeue_all_requests(device);
-}
-EXPORT_SYMBOL_GPL(dasd_generic_pm_freeze);
-
-int dasd_generic_restore_device(struct ccw_device *cdev)
-{
-	struct dasd_device *device = dasd_device_from_cdev(cdev);
-	int rc = 0;
-
-	if (IS_ERR(device))
-		return PTR_ERR(device);
-
-	/* allow new IO again */
-	dasd_device_remove_stop_bits(device,
-				     (DASD_STOPPED_PM | DASD_UNRESUMED_PM));
-
-	dasd_schedule_device_bh(device);
-
-	/*
-	 * call discipline restore function
-	 * if device is stopped do nothing e.g. for disconnected devices
-	 */
-	if (device->discipline->restore && !(device->stopped))
-		rc = device->discipline->restore(device);
-	if (rc || device->stopped)
-		/*
-		 * if the resume failed for the DASD we put it in
-		 * an UNRESUMED stop state
-		 */
-		device->stopped |= DASD_UNRESUMED_PM;
-
-	if (device->block) {
-		dasd_schedule_block_bh(device->block);
-		if (device->block->request_queue)
-			blk_mq_run_hw_queues(device->block->request_queue,
-					     true);
-	}
-
-	clear_bit(DASD_FLAG_SUSPENDED, &device->flags);
-	dasd_put_device(device);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
-
 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
 						   int rdc_buffer_size,
 						   int magic)

drivers/s390/block/dasd_eckd.c

@@ -5716,95 +5716,6 @@ static void dasd_eckd_dump_sense(struct dasd_device *device,
 	}
 }
 
-static int dasd_eckd_pm_freeze(struct dasd_device *device)
-{
-	/*
-	 * the device should be disconnected from our LCU structure
-	 * on restore we will reconnect it and reread LCU specific
-	 * information like PAV support that might have changed
-	 */
-	dasd_alias_remove_device(device);
-	dasd_alias_disconnect_device_from_lcu(device);
-
-	return 0;
-}
-
-static int dasd_eckd_restore_device(struct dasd_device *device)
-{
-	struct dasd_eckd_private *private = device->private;
-	struct dasd_eckd_characteristics temp_rdc_data;
-	int rc;
-	struct dasd_uid temp_uid;
-	unsigned long flags;
-	unsigned long cqr_flags = 0;
-
-	/* Read Configuration Data */
-	rc = dasd_eckd_read_conf(device);
-	if (rc) {
-		DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
-				"Read configuration data failed, rc=%d", rc);
-		goto out_err;
-	}
-
-	dasd_eckd_get_uid(device, &temp_uid);
-	/* Generate device unique id */
-	rc = dasd_eckd_generate_uid(device);
-	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
-	if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
-		dev_err(&device->cdev->dev, "The UID of the DASD has "
-			"changed\n");
-	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
-	if (rc)
-		goto out_err;
-
-	/* register lcu with alias handling, enable PAV if this is a new lcu */
-	rc = dasd_alias_make_device_known_to_lcu(device);
-	if (rc)
-		goto out_err;
-
-	set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
-	dasd_eckd_validate_server(device, cqr_flags);
-
-	/* RE-Read Configuration Data */
-	rc = dasd_eckd_read_conf(device);
-	if (rc) {
-		DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
-			"Read configuration data failed, rc=%d", rc);
-		goto out_err2;
-	}
-
-	/* Read Feature Codes */
-	dasd_eckd_read_features(device);
-
-	/* Read Volume Information */
-	dasd_eckd_read_vol_info(device);
-
-	/* Read Extent Pool Information */
-	dasd_eckd_read_ext_pool_info(device);
-
-	/* Read Device Characteristics */
-	rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
-					 &temp_rdc_data, 64);
-	if (rc) {
-		DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
-				"Read device characteristic failed, rc=%d", rc);
-		goto out_err2;
-	}
-	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
-	memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
-	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
-
-	/* add device to alias management */
-	dasd_alias_add_device(device);
-
-	return 0;
-
-out_err2:
-	dasd_alias_disconnect_device_from_lcu(device);
-out_err:
-	return -1;
-}
-
 static int dasd_eckd_reload_device(struct dasd_device *device)
 {
 	struct dasd_eckd_private *private = device->private;
@@ -6668,9 +6579,6 @@ static struct ccw_driver dasd_eckd_driver = {
 	.notify      = dasd_generic_notify,
 	.path_event  = dasd_generic_path_event,
 	.shutdown    = dasd_generic_shutdown,
-	.freeze      = dasd_generic_pm_freeze,
-	.thaw	     = dasd_generic_restore_device,
-	.restore     = dasd_generic_restore_device,
 	.uc_handler  = dasd_generic_uc_handler,
 	.int_class   = IRQIO_DAS,
 };
@@ -6702,8 +6610,6 @@ static struct dasd_discipline dasd_eckd_discipline = {
 	.dump_sense_dbf = dasd_eckd_dump_sense_dbf,
 	.fill_info = dasd_eckd_fill_info,
 	.ioctl = dasd_eckd_ioctl,
-	.freeze = dasd_eckd_pm_freeze,
-	.restore = dasd_eckd_restore_device,
 	.reload = dasd_eckd_reload_device,
 	.get_uid = dasd_eckd_get_uid,
 	.kick_validate = dasd_eckd_kick_validate_server,

drivers/s390/block/dasd_fba.c

@@ -79,9 +79,6 @@ static struct ccw_driver dasd_fba_driver = {
 	.set_online  = dasd_fba_set_online,
 	.notify      = dasd_generic_notify,
 	.path_event  = dasd_generic_path_event,
-	.freeze      = dasd_generic_pm_freeze,
-	.thaw	     = dasd_generic_restore_device,
-	.restore     = dasd_generic_restore_device,
 	.int_class   = IRQIO_DAS,
 };
 

drivers/s390/block/dasd_int.h

@@ -355,10 +355,6 @@ struct dasd_discipline {
 	int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 	int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 
-	/* suspend/resume functions */
-	int (*freeze) (struct dasd_device *);
-	int (*restore) (struct dasd_device *);
-
 	/* reload device after state change */
 	int (*reload) (struct dasd_device *);
 
@@ -520,7 +516,6 @@ struct dasd_device {
 	atomic_t tasklet_scheduled;
         struct tasklet_struct tasklet;
 	struct work_struct kick_work;
-	struct work_struct restore_device;
 	struct work_struct reload_device;
 	struct work_struct kick_validate;
 	struct work_struct suc_work;
@@ -592,8 +587,6 @@ struct dasd_queue {
 #define DASD_STOPPED_PENDING 4         /* long busy */
 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 #define DASD_STOPPED_SU      16        /* summary unit check handling */
-#define DASD_STOPPED_PM      32        /* pm state transition */
-#define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 #define DASD_STOPPED_NOSPC   128       /* no space left */
 
 /* per device flags */
@@ -753,7 +746,6 @@ enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
 void dasd_enable_device(struct dasd_device *);
 void dasd_set_target_state(struct dasd_device *, int);
 void dasd_kick_device(struct dasd_device *);
-void dasd_restore_device(struct dasd_device *);
 void dasd_reload_device(struct dasd_device *);
 void dasd_schedule_requeue(struct dasd_device *);
 
@@ -785,8 +777,6 @@ int dasd_generic_path_operational(struct dasd_device *);
 void dasd_generic_shutdown(struct ccw_device *);
 
 void dasd_generic_handle_state_change(struct dasd_device *);
-int dasd_generic_pm_freeze(struct ccw_device *);
-int dasd_generic_restore_device(struct ccw_device *);
 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
 void dasd_generic_path_event(struct ccw_device *, int *);
 int dasd_generic_verify_path(struct dasd_device *, __u8);