489 	struct doorbell_queue *dbq;  in fsl_hv_queue_doorbell()  local
495 	list_for_each_entry(dbq, &db_list, list) {  in fsl_hv_queue_doorbell()
496 		if (dbq->head != nextp(dbq->tail)) {  in fsl_hv_queue_doorbell()
497 			dbq->q[dbq->tail] = doorbell;  in fsl_hv_queue_doorbell()
503 			dbq->tail = nextp(dbq->tail);  in fsl_hv_queue_doorbell()
504 			wake_up_interruptible(&dbq->wait);  in fsl_hv_queue_doorbell()
570 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_poll()  local
574 	spin_lock_irqsave(&dbq->lock, flags);  in fsl_hv_poll()
576 	poll_wait(filp, &dbq->wait, p);  in fsl_hv_poll()
577 	mask = (dbq->head == dbq->tail) ? 0 : (EPOLLIN | EPOLLRDNORM);  in fsl_hv_poll()
579 	spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_poll()
594 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_read()  local
603 		spin_lock_irqsave(&dbq->lock, flags);  in fsl_hv_read()
610 		if (dbq->head == dbq->tail) {  in fsl_hv_read()
611 			spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_read()
616 			if (wait_event_interruptible(dbq->wait,  in fsl_hv_read()
617 						     dbq->head != dbq->tail))  in fsl_hv_read()
635 		dbell = dbq->q[dbq->head];  in fsl_hv_read()
636 		dbq->head = nextp(dbq->head);  in fsl_hv_read()
638 		spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_read()
658 	struct doorbell_queue *dbq;  in fsl_hv_open()  local
662 	dbq = kzalloc(sizeof(struct doorbell_queue), GFP_KERNEL);  in fsl_hv_open()
663 	if (!dbq) {  in fsl_hv_open()
668 	spin_lock_init(&dbq->lock);  in fsl_hv_open()
669 	init_waitqueue_head(&dbq->wait);  in fsl_hv_open()
672 	list_add(&dbq->list, &db_list);  in fsl_hv_open()
675 	filp->private_data = dbq;  in fsl_hv_open()
685 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_close()  local
691 	list_del(&dbq->list);  in fsl_hv_close()
694 	kfree(dbq);  in fsl_hv_close()