[PATCH] virtio-rng: complete have_data completion in removing device

[Amos Kong <akong@redhat.com>]

When we try to hot-remove a busy virtio-rng device from QEMU monitor,
the device can't be hot-removed. Because virtio-rng driver hangs at
wait_for_completion_killable().

This patch fixed the hang by completing have_data completion before
unregistering a virtio-rng device.

Signed-off-by: Amos Kong <akong@redhat.com>
Cc: stable@vger.kernel.org
---
 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 0027137..416b15c 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -137,6 +137,7 @@ static void remove_common(struct virtio_device *vdev)
 	struct virtrng_info *vi = vdev->priv;
 
 	vdev->config->reset(vdev);
+	complete(&vi->have_data);
 	vi->busy = false;
 	if (vi->hwrng_register_done)
 		hwrng_unregister(&vi->hwrng);
-- 
1.9.3