diff options
Diffstat (limited to 'drivers/s390/block/dasd_alias.c')
| -rw-r--r-- | drivers/s390/block/dasd_alias.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c index cdc6c049c353..fd1231738ef4 100644 --- a/drivers/s390/block/dasd_alias.c +++ b/drivers/s390/block/dasd_alias.c @@ -152,6 +152,7 @@ static struct alias_lcu *_allocate_lcu(struct dasd_uid *uid) INIT_WORK(&lcu->suc_data.worker, summary_unit_check_handling_work); INIT_DELAYED_WORK(&lcu->ruac_data.dwork, lcu_update_work); spin_lock_init(&lcu->lock); + init_completion(&lcu->lcu_setup); return lcu; out_err4: @@ -240,6 +241,67 @@ int dasd_alias_make_device_known_to_lcu(struct dasd_device *device) } /* + * 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) +{ + struct dasd_eckd_private *private; + unsigned long flags; + struct alias_server *server; + struct alias_lcu *lcu; + struct dasd_uid *uid; + + private = (struct dasd_eckd_private *) device->private; + uid = &private->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) +{ + struct dasd_eckd_private *private; + unsigned long flags; + struct alias_server *server; + struct alias_lcu *lcu; + struct dasd_uid *uid; + + private = (struct dasd_eckd_private *) device->private; + uid = &private->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); +} + +/* * This function removes a device from the scope of alias management. * The complicated part is to make sure that it is not in use by * any of the workers. If necessary cancel the work. |