--- a/drivers/scsi/scsi_lib.c	2014-10-05 21:23:04.000000000 +0200
+++ b/drivers/scsi/scsi_lib.c	2014-11-11 00:24:29.656031943 +0100
@@ -1775,7 +1775,7 @@ static void scsi_request_fn(struct reque
 	blk_requeue_request(q, req);
 	atomic_dec(&sdev->device_busy);
 out_delay:
-	if (!atomic_read(&sdev->device_busy) && !scsi_device_blocked(sdev))
+	if (atomic_read(&sdev->device_busy) && !scsi_device_blocked(sdev))
 		blk_delay_queue(q, SCSI_QUEUE_DELAY);
 }