Merge remote-tracking branch 'remotes/amit-virtio-rng/tags/vrng-2.4' into staging Fire timer only when required. Brings down wakeups by a big number. # gpg: Signature made Fri Jul 17 14:41:40 2015 BST using RSA key ID 854083B6 # gpg: Good signature from "Amit Shah <amit@amitshah.net>" # gpg: aka "Amit Shah <amit@kernel.org>" # gpg: aka "Amit Shah <amitshah@gmx.net>" * remotes/amit-virtio-rng/tags/vrng-2.4: virtio-rng: trigger timer only when guest requests for entropy Signed-off-by: Peter Maydell <peter.maydell@linaro.org>