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virtio-serial-bus: Ports are expected to implement 'have_data' callback 

There's no need to check if ports can accept any incoming data from the
guest each time the guest sends data.  Check if the port implements such
functionality during port initialisation.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Amit Shah 2011-12-21 12:28:29 +05:30 committed by Anthony Liguori
parent 05e7af694c
commit 03ecd2c80a
1 changed files with 3 additions and 3 deletions
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6
hw/virtio-serial-bus.c
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@ -466,13 +466,11 @@ static void handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOSerial *vser;
VirtIOSerialPort *port;
VirtIOSerialPortInfo *info;
vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
port = find_port_by_vq(vser, vq);
info = port ? DO_UPCAST(VirtIOSerialPortInfo, qdev, port->dev.info) : NULL;
if (!port || !port->host_connected || !info->have_data) {
if (!port || !port->host_connected) {
discard_vq_data(vq, vdev);
return;
}
@ -746,6 +744,8 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
port->vser = bus->vser;
port->bh = qemu_bh_new(flush_queued_data_bh, port);
assert(info->have_data);
/*
* Is the first console port we're seeing? If so, put it up at
* location 0. This is done for backward compatibility (old