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virtio-rng: ask for more data if queue is not fully drained

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This commit effectively reverts:

  commit 4621c1768ef5d12171cca2aa1473595ecb9f1c9e
  Author: Amit Shah <amit.shah@redhat.com>
  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 <lprosek@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1456998514-19271-1-git-send-email-lprosek@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Ladi Prosek 2016-03-03 10:48:34 +01:00 committed by Amit Shah
parent 60253ed1e6
commit f8693c2cd0
1 changed files with 7 additions and 0 deletions
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7
hw/virtio/virtio-rng.c
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@ -69,6 +69,13 @@ static void chr_read(void *opaque, const void *buf, size_t size)
g_free(elem); g_free(elem);
} }
virtio_notify(vdev, vrng->vq); 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) static void virtio_rng_process(VirtIORNG *vrng)