1 files changed, 49 insertions, 2 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index ee09ef33d08d..7d5a6cee4bd8 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -446,6 +446,39 @@ dasd_eckd_cdl_reclen(int recid)
         return LABEL_SIZE;
 }
 
+/*
+ * Generate device unique id that specifies the physical device.
+ */
+static int
+dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
+{
+        struct dasd_eckd_private *private;
+        struct dasd_eckd_confdata *confdata;
+
+        private = (struct dasd_eckd_private *) device->private;
+        if (!private)
+                return -ENODEV;
+        confdata = &private->conf_data;
+        if (!confdata)
+                return -ENODEV;
+
+        memset(uid, 0, sizeof(struct dasd_uid));
+        strncpy(uid->vendor, confdata->ned1.HDA_manufacturer,
+                sizeof(uid->vendor) - 1);
+        EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
+        strncpy(uid->serial, confdata->ned1.HDA_location,
+                sizeof(uid->serial) - 1);
+        EBCASC(uid->serial, sizeof(uid->serial) - 1);
+        uid->ssid = confdata->neq.subsystemID;
+        if (confdata->ned2.sneq.flags == 0x40) {
+                uid->alias = 1;
+                uid->unit_addr = confdata->ned2.sneq.base_unit_addr;
+        } else
+                uid->unit_addr = confdata->ned1.unit_addr;
+
+        return 0;
+}
+
 static int
 dasd_eckd_read_conf(struct dasd_device *device)
 {
@@ -507,11 +540,15 @@ dasd_eckd_read_conf(struct dasd_device *device)
         return 0;
 }
 
-
+/*
+ * Check device characteristics.
+ * If the device is accessible using ECKD discipline, the device is enabled.
+ */
 static int
 dasd_eckd_check_characteristics(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
+        struct dasd_uid uid;
         void *rdc_data;
         int rc;
 
@@ -536,6 +573,7 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
 
         /* Read Device Characteristics */
         rdc_data = (void *) &(private->rdc_data);
+        memset(rdc_data, 0, sizeof(rdc_data));
         rc = read_dev_chars(device->cdev, &rdc_data, 64);
         if (rc) {
                 DEV_MESSAGE(KERN_WARNING, device,
@@ -556,8 +594,17 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
 
         /* Read Configuration Data */
         rc = dasd_eckd_read_conf (device);
-        return rc;
+        if (rc)
+                return rc;
+
+        /* Generate device unique id and register in devmap */
+        rc = dasd_eckd_generate_uid(device, &uid);
+        if (rc)
+                return rc;
 
+        rc = dasd_set_uid(device->cdev, &uid);
+
+        return rc;
 }
 
 static struct dasd_ccw_req *