491 	struct doorbell_queue *dbq;  in fsl_hv_queue_doorbell()  local
497 	list_for_each_entry(dbq, &db_list, list) {  in fsl_hv_queue_doorbell()
498 		if (dbq->head != nextp(dbq->tail)) {  in fsl_hv_queue_doorbell()
499 			dbq->q[dbq->tail] = doorbell;  in fsl_hv_queue_doorbell()
505 			dbq->tail = nextp(dbq->tail);  in fsl_hv_queue_doorbell()
506 			wake_up_interruptible(&dbq->wait);  in fsl_hv_queue_doorbell()
572 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_poll()  local
576 	spin_lock_irqsave(&dbq->lock, flags);  in fsl_hv_poll()
578 	poll_wait(filp, &dbq->wait, p);  in fsl_hv_poll()
579 	mask = (dbq->head == dbq->tail) ? 0 : (EPOLLIN | EPOLLRDNORM);  in fsl_hv_poll()
581 	spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_poll()
596 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_read()  local
605 		spin_lock_irqsave(&dbq->lock, flags);  in fsl_hv_read()
612 		if (dbq->head == dbq->tail) {  in fsl_hv_read()
613 			spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_read()
618 			if (wait_event_interruptible(dbq->wait,  in fsl_hv_read()
619 						     dbq->head != dbq->tail))  in fsl_hv_read()
637 		dbell = dbq->q[dbq->head];  in fsl_hv_read()
638 		dbq->head = nextp(dbq->head);  in fsl_hv_read()
640 		spin_unlock_irqrestore(&dbq->lock, flags);  in fsl_hv_read()
660 	struct doorbell_queue *dbq;  in fsl_hv_open()  local
663 	dbq = kzalloc(sizeof(struct doorbell_queue), GFP_KERNEL);  in fsl_hv_open()
664 	if (!dbq) {  in fsl_hv_open()
669 	spin_lock_init(&dbq->lock);  in fsl_hv_open()
670 	init_waitqueue_head(&dbq->wait);  in fsl_hv_open()
673 	list_add(&dbq->list, &db_list);  in fsl_hv_open()
676 	filp->private_data = dbq;  in fsl_hv_open()
686 	struct doorbell_queue *dbq = filp->private_data;  in fsl_hv_close()  local
690 	list_del(&dbq->list);  in fsl_hv_close()
693 	kfree(dbq);  in fsl_hv_close()