1 files changed, 103 insertions, 13 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 0cb23311685..5b1cd8d6e97 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -692,18 +692,20 @@ dasd_eckd_cdl_reclen(int recid)
 /*
  * Generate device unique id that specifies the physical device.
  */
-static int dasd_eckd_generate_uid(struct dasd_device *device,
-                                  struct dasd_uid *uid)
+static int dasd_eckd_generate_uid(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
+        struct dasd_uid *uid;
         int count;
+        unsigned long flags;
 
         private = (struct dasd_eckd_private *) device->private;
         if (!private)
                 return -ENODEV;
         if (!private->ned || !private->gneq)
                 return -ENODEV;
-
+        uid = &private->uid;
+        spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
         memset(uid, 0, sizeof(struct dasd_uid));
         memcpy(uid->vendor, private->ned->HDA_manufacturer,
                sizeof(uid->vendor) - 1);
@@ -726,9 +728,25 @@ static int dasd_eckd_generate_uid(struct dasd_device *device,
                                 private->vdsneq->uit[count]);
                 }
         }
+        spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
         return 0;
 }
 
+static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
+{
+        struct dasd_eckd_private *private;
+        unsigned long flags;
+
+        if (device->private) {
+                private = (struct dasd_eckd_private *)device->private;
+                spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
+                *uid = private->uid;
+                spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+                return 0;
+        }
+        return -EINVAL;
+}
+
 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
                                                     void *rcd_buffer,
                                                     struct ciw *ciw, __u8 lpm)
@@ -1088,6 +1106,7 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
         struct dasd_block *block;
+        struct dasd_uid temp_uid;
         int is_known, rc;
         int readonly;
 
@@ -1124,13 +1143,13 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
         if (rc)
                 goto out_err1;
 
-        /* Generate device unique id and register in devmap */
-        rc = dasd_eckd_generate_uid(device, &private->uid);
+        /* Generate device unique id */
+        rc = dasd_eckd_generate_uid(device);
         if (rc)
                 goto out_err1;
-        dasd_set_uid(device->cdev, &private->uid);
 
-        if (private->uid.type == UA_BASE_DEVICE) {
+        dasd_eckd_get_uid(device, &temp_uid);
+        if (temp_uid.type == UA_BASE_DEVICE) {
                 block = dasd_alloc_block();
                 if (IS_ERR(block)) {
                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
@@ -1451,6 +1470,7 @@ static int dasd_eckd_ready_to_online(struct dasd_device *device)
 
 static int dasd_eckd_online_to_ready(struct dasd_device *device)
 {
+        cancel_work_sync(&device->reload_device);
         return dasd_alias_remove_device(device);
 };
 
@@ -1709,10 +1729,27 @@ static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
 {
         char mask;
         char *sense = NULL;
+        struct dasd_eckd_private *private;
 
+        private = (struct dasd_eckd_private *) device->private;
         /* first of all check for state change pending interrupt */
         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
+                /* for alias only and not in offline processing*/
+                if (!device->block && private->lcu &&
+                    !test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
+                        /*
+                         * the state change could be caused by an alias
+                         * reassignment remove device from alias handling
+                         * to prevent new requests from being scheduled on
+                         * the wrong alias device
+                         */
+                        dasd_alias_remove_device(device);
+
+                        /* schedule worker to reload device */
+                        dasd_reload_device(device);
+                }
+
                 dasd_generic_handle_state_change(device);
                 return;
         }
@@ -3259,7 +3296,7 @@ static void dasd_eckd_dump_sense(struct dasd_device *device,
                 dasd_eckd_dump_sense_ccw(device, req, irb);
 }
 
-int dasd_eckd_pm_freeze(struct dasd_device *device)
+static int dasd_eckd_pm_freeze(struct dasd_device *device)
 {
         /*
          * the device should be disconnected from our LCU structure
@@ -3272,7 +3309,7 @@ int dasd_eckd_pm_freeze(struct dasd_device *device)
         return 0;
 }
 
-int dasd_eckd_restore_device(struct dasd_device *device)
+static int dasd_eckd_restore_device(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
         struct dasd_eckd_characteristics temp_rdc_data;
@@ -3287,15 +3324,16 @@ int dasd_eckd_restore_device(struct dasd_device *device)
         if (rc)
                 goto out_err;
 
-        /* Generate device unique id and register in devmap */
-        rc = dasd_eckd_generate_uid(device, &private->uid);
-        dasd_get_uid(device->cdev, &temp_uid);
+        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;
-        dasd_set_uid(device->cdev, &private->uid);
 
         /* register lcu with alias handling, enable PAV if this is a new lcu */
         is_known = dasd_alias_make_device_known_to_lcu(device);
@@ -3336,6 +3374,56 @@ out_err:
         return -1;
 }
 
+static int dasd_eckd_reload_device(struct dasd_device *device)
+{
+        struct dasd_eckd_private *private;
+        int rc, old_base;
+        char print_uid[60];
+        struct dasd_uid uid;
+        unsigned long flags;
+
+        private = (struct dasd_eckd_private *) device->private;
+
+        spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
+        old_base = private->uid.base_unit_addr;
+        spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+
+        /* Read Configuration Data */
+        rc = dasd_eckd_read_conf(device);
+        if (rc)
+                goto out_err;
+
+        rc = dasd_eckd_generate_uid(device);
+        if (rc)
+                goto out_err;
+        /*
+         * update unit address configuration and
+         * add device to alias management
+         */
+        dasd_alias_update_add_device(device);
+
+        dasd_eckd_get_uid(device, &uid);
+
+        if (old_base != uid.base_unit_addr) {
+                if (strlen(uid.vduit) > 0)
+                        snprintf(print_uid, sizeof(print_uid),
+                                 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
+                                 uid.ssid, uid.base_unit_addr, uid.vduit);
+                else
+                        snprintf(print_uid, sizeof(print_uid),
+                                 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
+                                 uid.ssid, uid.base_unit_addr);
+
+                dev_info(&device->cdev->dev,
+                         "An Alias device was reassigned to a new base device "
+                         "with UID: %s\n", print_uid);
+        }
+        return 0;
+
+out_err:
+        return -1;
+}
+
 static struct ccw_driver dasd_eckd_driver = {
         .name        = "dasd-eckd",
         .owner       = THIS_MODULE,
@@ -3389,6 +3477,8 @@ static struct dasd_discipline dasd_eckd_discipline = {
         .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,
 };
 
 static int __init