From f8693c2cd06d0401007b2c168126ab907f6da345 Mon Sep 17 00:00:00 2001 From: Ladi Prosek Date: Thu, 3 Mar 2016 10:48:34 +0100 Subject: virtio-rng: ask for more data if queue is not fully drained This commit effectively reverts: commit 4621c1768ef5d12171cca2aa1473595ecb9f1c9e Author: Amit Shah Date: Wed Nov 21 11:21:19 2012 +0530 virtio-rng: remove extra request for entropy but instead of calling virtio_rng_process unconditionally, it first checks to see if the queue is empty as a little bit of optimization. Signed-off-by: Ladi Prosek Reviewed-by: Amit Shah Message-Id: <1456998514-19271-1-git-send-email-lprosek@redhat.com> Signed-off-by: Amit Shah --- hw/virtio/virtio-rng.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'hw') diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c index 17da2f8..d713464 100644 --- a/hw/virtio/virtio-rng.c +++ b/hw/virtio/virtio-rng.c @@ -69,6 +69,13 @@ static void chr_read(void *opaque, const void *buf, size_t size) g_free(elem); } virtio_notify(vdev, vrng->vq); + + if (!virtio_queue_empty(vrng->vq)) { + /* If we didn't drain the queue, call virtio_rng_process + * to take care of asking for more data as appropriate. + */ + virtio_rng_process(vrng); + } } static void virtio_rng_process(VirtIORNG *vrng) -- cgit v1.1