From eb9d4673e3594baaa857a4c033fc7c21f4ea904b Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 28 Feb 2012 15:36:06 +0100
Subject: [PATCH] usb: queue can have async packets

This can happen today in case the ->complete() callback queues up the
next packet.  Also we'll support pipelining soon, which allows to have
multiple packets per queue in flight (aka ASYNC) state.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/usb.c b/hw/usb.c
index 57fc5e3cfd..fc41d62438 100644
--- a/hw/usb.c
+++ b/hw/usb.c
@@ -356,6 +356,9 @@ void usb_packet_complete(USBDevice *dev, USBPacket *p)
 
     while (!QTAILQ_EMPTY(&ep->queue)) {
         p = QTAILQ_FIRST(&ep->queue);
+        if (p->state == USB_PACKET_ASYNC) {
+            break;
+        }
         assert(p->state == USB_PACKET_QUEUED);
         ret = usb_process_one(p);
         if (ret == USB_RET_ASYNC) {
-- 
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