RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1121540

When we try to hot-unplugging a busy virtio-rng device, the device
can't be removed. And the reading process in guest gets stuck.

Those two patches fixed this issue by completing have_data completion
and preventing invalid reading.

Thanks for the help of Amit.

Cc: stable@vger.kernel.org

V2: reset data_avail (Amit)
    adjust unregister order
V3: split patch, update commitlog

Amos Kong (2):
  virtio-rng: fix stuck of hot-unplugging busy device
  virtio-rng: skip reading when we start to remove the device

 drivers/char/hw_random/virtio-rng.c | 7 +++++++
 1 file changed, 7 insertions(+)

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1.9.3