[Bug 269823] rand_harvest produces 100%CPU on 1 CPU with virtio_random.ko loaded

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269823

--- Comment #6 from Mina Galić <freebsd@igalic.co> ---
n.b.: virtio_random is the only call-site of virtqueue_poll() that passes
something other than NULL to the *len parameter:

sys/dev/virtio/console/virtio_console.c
988:            virtqueue_poll(vq, NULL);
1382:           virtqueue_poll(vq, NULL);

sys/dev/virtio/random/virtio_random.c
288:    virtqueue_poll(vq, &rdlen);

sys/dev/virtio/block/virtio_blk.c
1442:   virtqueue_poll(vq, NULL);

sys/dev/virtio/network/if_vtnet.c
3526:           virtqueue_poll(vq, NULL);

tho i don't see how that would influence it.

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