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[Qemu-devel] [PULL 6/6] virtio-rng: ask for more data if queue is not fu
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PULL 6/6] virtio-rng: ask for more data if queue is not fully drained |
Date: |
Thu, 3 Mar 2016 18:07:11 +0530 |
From: Ladi Prosek <address@hidden>
This commit effectively reverts:
commit 4621c1768ef5d12171cca2aa1473595ecb9f1c9e
Author: Amit Shah <address@hidden>
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 <address@hidden>
Reviewed-by: Amit Shah <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Amit Shah <address@hidden>
---
hw/virtio/virtio-rng.c | 7 +++++++
1 file changed, 7 insertions(+)
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)
--
2.5.0
- [Qemu-devel] [PULL 0/6] virtio-rng, Amit Shah, 2016/03/03
- [Qemu-devel] [PULL 2/6] rng: remove the unused request cancellation code, Amit Shah, 2016/03/03
- [Qemu-devel] [PULL 1/6] MAINTAINERS: Add an entry for the include/sysemu/rng*.h files, Amit Shah, 2016/03/03
- [Qemu-devel] [PULL 4/6] rng: move request queue cleanup from RngEgd to RngBackend, Amit Shah, 2016/03/03
- [Qemu-devel] [PULL 5/6] rng: add request queue support to rng-random, Amit Shah, 2016/03/03
- [Qemu-devel] [PULL 3/6] rng: move request queue from RngEgd to RngBackend, Amit Shah, 2016/03/03
- [Qemu-devel] [PULL 6/6] virtio-rng: ask for more data if queue is not fully drained,
Amit Shah <=
- Re: [Qemu-devel] [PULL 0/6] virtio-rng, Peter Maydell, 2016/03/03