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vhost: do not update last avail idx on get_vring_base() failure 

The state.num value will probably be 0 in this case, but that
doesn't make sense to update.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau 2016-07-27 01:15:27 +04:00 committed by Michael S. Tsirkin
parent 950d94ba06
commit 499c557975
1 changed files with 2 additions and 1 deletions
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3
hw/virtio/vhost.c
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@ -945,8 +945,9 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev,
r = dev->vhost_ops->vhost_get_vring_base(dev, &state);
if (r < 0) {
VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r);
} else {
virtio_queue_set_last_avail_idx(vdev, idx, state.num);
}
virtio_queue_set_last_avail_idx(vdev, idx, state.num);
virtio_queue_invalidate_signalled_used(vdev, idx);
/* In the cross-endian case, we need to reset the vring endianness to