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

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Message-Id: <d2e8c74866e002fe8c9ec62c00dc70a75328ecf9.1405277045.git.amit.shah@redhat.com>
Date:	Mon, 14 Jul 2014 10:05:20 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Virtualization List <virtualization@...ts.linux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	herbert@...dor.apana.org.au, keescook@...omium.org,
	jason@...edaemon.net, Amit Shah <amit.shah@...hat.com>
Subject: [RFC PATCH 2/3] virtio: rng: only accept delayed early randomness requests

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@...omium.org>
CC: Jason Cooper <jason@...edaemon.net>
CC: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Amit Shah <amit.shah@...hat.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

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