drbd: Do not send state packets while lower than C_CONNECTED cstate

I.e. in C_WF_REPORT_PARAMS or in C_WF_CONNECTION.
Sending may already work in these cstates, but the peer still expects
the HandShake / ConnectionFeatures packet.

Actually triggered by the Testuite on kugel.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_main.c

@@ -1612,8 +1612,8 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
 				"ASSERT FAILED: disk is %s during detach\n",
 				drbd_disk_str(mdev->state.disk));
 
-		if (drbd_send_state(mdev, ns))
-			dev_info(DEV, "Notified peer that I am detaching my disk\n");
+		if (ns.conn >= C_CONNECTED)
+			drbd_send_state(mdev, ns);
 
 		drbd_rs_cancel_all(mdev);
 
@@ -1642,15 +1642,16 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
                 mdev->rs_failed = 0;
                 atomic_set(&mdev->rs_pending_cnt, 0);
 
-		if (drbd_send_state(mdev, ns))
-			dev_info(DEV, "Notified peer that I'm now diskless.\n");
+		if (ns.conn >= C_CONNECTED)
+			drbd_send_state(mdev, ns);
+
 		/* corresponding get_ldev in __drbd_set_state
 		 * this may finally trigger drbd_ldev_destroy. */
 		put_ldev(mdev);
 	}
 
 	/* Notify peer that I had a local IO error, and did not detached.. */
-	if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT)
+	if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED)
 		drbd_send_state(mdev, ns);
 
 	/* Disks got bigger while they were detached */