1 files changed, 11 insertions, 63 deletions

diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index c388eda1e2b..b3beed5434e 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -189,14 +189,12 @@ int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
 	unsigned long flags;
 	struct alias_server *server, *newserver;
 	struct alias_lcu *lcu, *newlcu;
-	int is_lcu_known;
 	struct dasd_uid uid;
 
 	private = (struct dasd_eckd_private *) device->private;
 
 	device->discipline->get_uid(device, &uid);
 	spin_lock_irqsave(&aliastree.lock, flags);
-	is_lcu_known = 1;
 	server = _find_server(&uid);
 	if (!server) {
 		spin_unlock_irqrestore(&aliastree.lock, flags);
@@ -208,7 +206,6 @@ int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
 		if (!server) {
 			list_add(&newserver->server, &aliastree.serverlist);
 			server = newserver;
-			is_lcu_known = 0;
 		} else {
 			/* someone was faster */
 			_free_server(newserver);
@@ -226,12 +223,10 @@ int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
 		if (!lcu) {
 			list_add(&newlcu->lcu, &server->lculist);
 			lcu = newlcu;
-			is_lcu_known = 0;
 		} else {
 			/* someone was faster */
 			_free_lcu(newlcu);
 		}
-		is_lcu_known = 0;
 	}
 	spin_lock(&lcu->lock);
 	list_add(&device->alias_list, &lcu->inactive_devices);
@@ -239,64 +234,7 @@ int dasd_alias_make_device_known_to_lcu(struct dasd_device *device)
 	spin_unlock(&lcu->lock);
 	spin_unlock_irqrestore(&aliastree.lock, flags);
 
-	return is_lcu_known;
-}
-
-/*
- * The first device to be registered on an LCU will have to do
- * some additional setup steps to configure that LCU on the
- * storage server. All further devices should wait with their
- * initialization until the first device is done.
- * To synchronize this work, the first device will call
- * dasd_alias_lcu_setup_complete when it is done, and all
- * other devices will wait for it with dasd_alias_wait_for_lcu_setup.
- */
-void dasd_alias_lcu_setup_complete(struct dasd_device *device)
-{
-	unsigned long flags;
-	struct alias_server *server;
-	struct alias_lcu *lcu;
-	struct dasd_uid uid;
-
-	device->discipline->get_uid(device, &uid);
-	lcu = NULL;
-	spin_lock_irqsave(&aliastree.lock, flags);
-	server = _find_server(&uid);
-	if (server)
-		lcu = _find_lcu(server, &uid);
-	spin_unlock_irqrestore(&aliastree.lock, flags);
-	if (!lcu) {
-		DBF_EVENT_DEVID(DBF_ERR, device->cdev,
-				"could not find lcu for %04x %02x",
-				uid.ssid, uid.real_unit_addr);
-		WARN_ON(1);
-		return;
-	}
-	complete_all(&lcu->lcu_setup);
-}
-
-void dasd_alias_wait_for_lcu_setup(struct dasd_device *device)
-{
-	unsigned long flags;
-	struct alias_server *server;
-	struct alias_lcu *lcu;
-	struct dasd_uid uid;
-
-	device->discipline->get_uid(device, &uid);
-	lcu = NULL;
-	spin_lock_irqsave(&aliastree.lock, flags);
-	server = _find_server(&uid);
-	if (server)
-		lcu = _find_lcu(server, &uid);
-	spin_unlock_irqrestore(&aliastree.lock, flags);
-	if (!lcu) {
-		DBF_EVENT_DEVID(DBF_ERR, device->cdev,
-				"could not find lcu for %04x %02x",
-				uid.ssid, uid.real_unit_addr);
-		WARN_ON(1);
-		return;
-	}
-	wait_for_completion(&lcu->lcu_setup);
+	return 0;
 }
 
 /*
@@ -705,6 +643,16 @@ struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
 	if (lcu->pav == NO_PAV ||
 	    lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
 		return NULL;
+	if (unlikely(!(private->features.feature[8] & 0x01))) {
+		/*
+		 * PAV enabled but prefix not, very unlikely
+		 * seems to be a lost pathgroup
+		 * use base device to do IO
+		 */
+		DBF_DEV_EVENT(DBF_ERR, base_device, "%s",
+			      "Prefix not enabled with PAV enabled\n");
+		return NULL;
+	}
 
 	spin_lock_irqsave(&lcu->lock, flags);
 	alias_device = group->next;