[RFC PATCH 2/3] virtio: rng: only accept delayed early randomness requests

Amit Shah
Mon, 14 Jul 2014 04:35:20 -0000

hw_random core can ask for initial randomness after a slight delay after
probe() finishes, and we can contribute to system randomness at that
point.  Tell the hw_random core by setting the HWRNG_DELAY_READ_AT_INIT
flag.

CC: Kees Cook <keescook at chromium.org>
CC: Jason Cooper <jason at lakedaemon.net>
CC: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Amit Shah <amit.shah at redhat.com>
---
 drivers/char/hw_random/virtio-rng.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/hw_random/virtio-rng.c
b/drivers/char/hw_random/virtio-rng.c
index d8ffebd..f53f1e8 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -123,6 +123,7 @@ static int probe_common(struct virtio_device *vdev)
 		.cleanup = virtio_cleanup,
 		.priv = (unsigned long)vi,
 		.name = vi->name,
+		.flags = HWRNG_DELAY_READ_AT_INIT,
 	};
 	vdev->priv = vi;

--
1.9.3