493 	struct doorbell_queue *dbq;  in fsl_hv_queue_doorbell()  local
499 	list_for_each_entry(dbq, &db_list, list) {  in fsl_hv_queue_doorbell()
500 		if (dbq->head != nextp(dbq->tail)) {  in fsl_hv_queue_doorbell()
501 			dbq->q[dbq->tail] = doorbell;  in fsl_hv_queue_doorbell()
507 			dbq->tail = nextp(dbq->tail);  in fsl_hv_queue_doorbell()
508 			wake_up_interruptible(&dbq->wait);  in fsl_hv_queue_doorbell()
574 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_poll()  local
578 	spin_lock_irqsave(&dbq->lock, flags);  in fsl_hv_poll()
580 	poll_wait(filp, &dbq->wait, p);  in fsl_hv_poll()
581 	mask = (dbq->head == dbq->tail) ? 0 : (POLLIN | POLLRDNORM);  in fsl_hv_poll()
583 	spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_poll()
598 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_read()  local
607 		spin_lock_irqsave(&dbq->lock, flags);  in fsl_hv_read()
614 		if (dbq->head == dbq->tail) {  in fsl_hv_read()
615 			spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_read()
620 			if (wait_event_interruptible(dbq->wait,  in fsl_hv_read()
621 						     dbq->head != dbq->tail))  in fsl_hv_read()
639 		dbell = dbq->q[dbq->head];  in fsl_hv_read()
640 		dbq->head = nextp(dbq->head);  in fsl_hv_read()
642 		spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_read()
662 	struct doorbell_queue *dbq;  in fsl_hv_open()  local
666 	dbq = kzalloc(sizeof(struct doorbell_queue), GFP_KERNEL);  in fsl_hv_open()
667 	if (!dbq) {  in fsl_hv_open()
672 	spin_lock_init(&dbq->lock);  in fsl_hv_open()
673 	init_waitqueue_head(&dbq->wait);  in fsl_hv_open()
676 	list_add(&dbq->list, &db_list);  in fsl_hv_open()
679 	filp->private_data = dbq;  in fsl_hv_open()
689 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_close()  local
695 	list_del(&dbq->list);  in fsl_hv_close()
698 	kfree(dbq);  in fsl_hv_close()