[S390] dasd: revert LCU optimization
Remove the optimization that validate server is only called once per
LCU. If a device is set online we only know that we already know the
LCU. But if the pathgroup was lost in between we have to do a
validate server again to activate some features.
Since we have no indication when a pathgroup gets lost we have to do
a validate server every time a device is set online.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index 553b3c5..b3beed5 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -189,14 +189,12 @@
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 @@
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 @@
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 @@
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;
}
/*