From patchwork Fri Mar  2 13:19:25 2012
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Subject: [2/7] usb: queue can have async packets
Date: Fri, 02 Mar 2012 03:19:25 -0000
From: Gerd Hoffmann <kraxel@redhat.com>
X-Patchwork-Id: 144253
Message-Id: <1330694370-1078-3-git-send-email-kraxel@redhat.com>
To: qemu-devel@nongnu.org
Cc: Gerd Hoffmann <kraxel@redhat.com>

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 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/hw/usb.c b/hw/usb.c
index 57fc5e3..fc41d62 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) {