diff options
| author | Amit Shah <amit.shah@redhat.com> | 2010-07-01 14:58:16 +0530 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-07-13 09:06:58 -0500 |
| commit | 6b611d3ab820d6e3b30a23ebac69df04ab0105a0 (patch) | |
| tree | b782027d4ee284f45ac8f400c61f247fe4faa7a3 /hw | |
| parent | a03c54f16eb35df6f8a08255cf44230a194c50bc (diff) | |
virtio-serial: Check if virtio queue is ready before consuming data
If a virtio-serial port is removed before the guest comes up and
initialises the virtqueues, qemu exits with the message
Guest moved used index from 0 to 61440
This happens because we try to clear any pending buffers from the
virtqueue.
Ensure the virtqueue is initialised before calling any virtqueue
operations.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/virtio-serial-bus.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c index 26d5841154..077c3183bc 100644 --- a/hw/virtio-serial-bus.c +++ b/hw/virtio-serial-bus.c @@ -139,6 +139,9 @@ static void flush_queued_data(VirtIOSerialPort *port, bool discard) { assert(port); + if (!virtio_queue_ready(port->ovq)) { + return; + } do_flush_queued_data(port, port->ovq, &port->vser->vdev, discard); } |