Linux Virtualization - Jun 2008 - [PATCH] virtio: Complete feature negotation before updating status

From: Mark McLoughlin <markmc at redhat.com>

lguest (in rusty's use-tun-ringfd patch) assumes that the
guest has updated its feature bits before setting its status
to VIRTIO_CONFIG_S_DRIVER_OK.

That's pretty reasonable, so let's make it so.

Signed-off-by: Mark McLoughlin <markmc at redhat.com>
Signed-off-by: Rusty Russell <rusty at rustcorp.com.au>
---
 drivers/virtio/virtio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index ab0aca7..fc85cba 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -117,9 +117,9 @@ static int virtio_dev_probe(struct device *_d)
 	if (err)
 		add_status(dev, VIRTIO_CONFIG_S_FAILED);
 	else {
-		add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
 		/* They should never have set feature bits beyond 32 */
 		dev->config->set_features(dev, dev->features[0]);
+		add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
 	}
 	return err;
 }