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virtio-serial: Make sure virtqueue is ready before discarding data

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This can happen if a port gets unplugged before guest has chance to
initialise vqs.

Reported-by: Juan Quintela <quintela@redhat.com>
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 2011-02-04 14:24:18 +05:30 committed by Anthony Liguori
parent 4e79bcbb96
commit 7185f9315b
1 changed files with 3 additions and 0 deletions
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3
hw/virtio-serial-bus.c
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@ -117,6 +117,9 @@ static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev)
{ {
VirtQueueElement elem; VirtQueueElement elem;
if (!virtio_queue_ready(vq)) {
return;
}
while (virtqueue_pop(vq, &elem)) { while (virtqueue_pop(vq, &elem)) {
virtqueue_push(vq, &elem, 0); virtqueue_push(vq, &elem, 0);
} }