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Date: Thu, 29 Dec 2011 15:32:14 +0100
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Subject: Re: [Qemu-devel] [PATCHv2] Fix virtio-console failure on
	unconnected pty
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To: Amit Shah <amit.shah@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Alexander Graf <agraf@suse.de>

> port->throttled never becomes true for qemu.  

Huh? What did I miss below?

            if (ret == -EAGAIN || (ret >= 0 && ret < buf_size)) {
                virtio_serial_throttle_port(port, true);
                                                   |
                                                   |
                                                   V
void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle)
{
    if (!port) {
        return;
    }

    trace_virtio_serial_throttle_port(port->id, throttle);
    port->throttled = throttle;              <-------------------- WHOOOT!
    if (throttle) {
        return;
    }
    qemu_bh_schedule(port->bh);
}