[S390] dasd: remove uid from devmap

Remove the duplicate of the DASD uid from the devmap structure.
Use the uid from the device private structure instead.
This also removes a lockdep warning complaining about a possible
SOFTIRQ-safe -> SOFTIRQ-unsafe lock order.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 51 insertions, 27 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 4305c23c57a4..5b1cd8d6e971 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",
@@ -3305,15 +3324,16 @@ static 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);
@@ -3358,42 +3378,45 @@ static int dasd_eckd_reload_device(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
         int rc, old_base;
-        char uid[60];
+        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, &private->uid);
+        rc = dasd_eckd_generate_uid(device);
         if (rc)
                 goto out_err;
-
-        dasd_set_uid(device->cdev, &private->uid);
-
         /*
          * update unit address configuration and
          * add device to alias management
          */
         dasd_alias_update_add_device(device);
 
-        if (old_base != private->uid.base_unit_addr) {
-                if (strlen(private->uid.vduit) > 0)
-                        snprintf(uid, 60, "%s.%s.%04x.%02x.%s",
-                                 private->uid.vendor, private->uid.serial,
-                                 private->uid.ssid, private->uid.base_unit_addr,
-                                 private->uid.vduit);
+        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(uid, 60, "%s.%s.%04x.%02x",
-                                 private->uid.vendor, private->uid.serial,
-                                 private->uid.ssid,
-                                 private->uid.base_unit_addr);
+                        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", uid);
+                         "with UID: %s\n", print_uid);
         }
         return 0;
 
@@ -3455,6 +3478,7 @@ static struct dasd_discipline dasd_eckd_discipline = {
         .freeze = dasd_eckd_pm_freeze,
         .restore = dasd_eckd_restore_device,
         .reload = dasd_eckd_reload_device,
+        .get_uid = dasd_eckd_get_uid,
 };
 
 static int __init