From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 28 Feb 2012 14:36:06 +0000 (+0100)
Subject: usb: queue can have async packets
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=eb9d4673e3594baaa857a4c033fc7c21f4ea904b;p=qemu.git

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>
---

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) {