s390/dasd: add missing KOBJ_CHANGE event for unformatted devices

The DASD device driver throws change events for the DASD blockdevice
after the online processing is done so that udev rules can take
actions after it.
The change event was missing for unformatted devices.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/block/dasd.c

@@ -336,6 +336,7 @@ static int dasd_state_basic_to_ready(struct dasd_device *device)
 {
 	int rc;
 	struct dasd_block *block;
+	struct gendisk *disk;
 
 	rc = 0;
 	block = device->block;
@@ -346,6 +347,9 @@ static int dasd_state_basic_to_ready(struct dasd_device *device)
 		if (rc) {
 			if (rc != -EAGAIN) {
 				device->state = DASD_STATE_UNFMT;
+				disk = device->block->gdp;
+				kobject_uevent(&disk_to_dev(disk)->kobj,
+					       KOBJ_CHANGE);
 				goto out;
 			}
 			return rc;