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virtio: check for vring setup in virtio_queue_empty 

If the vring has not been set up, there is nothing in the virtqueue.
virtio_queue_host_notifier_aio_poll calls virtio_queue_empty even in
this case; we have to filter it out just like virtio_queue_notify_aio_vq.

Reported-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Paolo Bonzini 2017-02-23 09:51:30 +01:00 committed by Michael S. Tsirkin
parent 42697d88de
commit dd3dd4ba7b
1 changed files with 1 additions and 1 deletions
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2
hw/virtio/virtio.c
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@ -2291,7 +2291,7 @@ static bool virtio_queue_host_notifier_aio_poll(void *opaque)
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
bool progress;
if (virtio_queue_empty(vq)) {
if (!vq->vring.desc || virtio_queue_empty(vq)) {
return false;
}