[PULL,6/6] virtio-rng: ask for more data if queue is not fully drained

Commit Message

Amit Shah March 3, 2016, 12:37 p.m. UTC

From: Ladi Prosek <[e-mail]>

This commit effectively reverts:

  commit 4621c1768ef5d12171cca2aa1473595ecb9f1c9e
  Author: Amit Shah <[e-mail]>
  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 <[e-mail]>
Reviewed-by: Amit Shah <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Amit Shah <[e-mail]>
---
 hw/virtio/virtio-rng.c | 7 +++++++
 1 file changed, 7 insertions(+)

Patch

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)