DASD: Send 'change' uevents

A DASD is only useable after the internal state machine transitioned
to 'ready', way after the device has been added to sysfs.
So we need to send out a 'change' event here to notify udev.

Signed-off-by: Hannes Reinecke <hare@suse.de>

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 0a225cc..447fcdc 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -335,7 +335,9 @@ static int dasd_state_unfmt_to_basic(struct dasd_device *device)
 static int
 dasd_state_ready_to_online(struct dasd_device * device)
 {
-	int rc;
+	int rc, i;
+	struct gendisk *disk = device->bdev->bd_disk;
+	struct hd_struct *p;
 
 	if (device->discipline->ready_to_online) {
 		rc = device->discipline->ready_to_online(device);
@@ -345,6 +347,15 @@ dasd_state_ready_to_online(struct dasd_device * device)
 	device->state = DASD_STATE_ONLINE;
 	if (device->block)
 		dasd_schedule_block_bh(device->block);
+
+	kobject_uevent(&disk->kobj, KOBJ_CHANGE);
+	/* send uevents for all partitions */
+	for (i = 1; i < disk->minors; i++) {
+		p = disk->part[i-1];
+		if (!p || !p->nr_sects)
+			continue;
+		kobject_uevent(&p->kobj, KOBJ_CHANGE);
+	}
 	return 0;
 }
 
@@ -353,7 +364,9 @@ dasd_state_ready_to_online(struct dasd_device * device)
  */
 static int dasd_state_online_to_ready(struct dasd_device *device)
 {
-	int rc;
+	int rc, i;
+	struct gendisk *disk = device->bdev->bd_disk;
+	struct hd_struct *p;
 
 	if (device->discipline->online_to_ready) {
 		rc = device->discipline->online_to_ready(device);
@@ -361,6 +374,14 @@ static int dasd_state_online_to_ready(struct dasd_device *device)
 			return rc;
 	}
 	device->state = DASD_STATE_READY;
+	/* send uevents for all partitions */
+	for (i = 1; i < disk->minors; i++) {
+		p = disk->part[i-1];
+		if (!p || !p->nr_sects)
+			continue;
+		kobject_uevent(&p->kobj, KOBJ_CHANGE);
+	}
+	kobject_uevent(&disk->kobj, KOBJ_CHANGE);
 	return 0;
 }