virtio: simplify config mechanism.

Previously we used a type/len pair within the config space, but this
seems overkill.  We now simply define a structure which represents the
layout in the config space: the config space can now only be extended
at the end.

The main driver-visible changes:
1) We indicate what fields are present with an explicit feature bit.
2) Virtqueues are explicitly numbered, and not in the config space.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 40b71a29fc3f..78d7946f81fe 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -236,13 +236,13 @@ static int p9_virtio_probe(struct virtio_device *dev)
 
         /* Find the input queue. */
         dev->priv = chan;
-        chan->in_vq = dev->config->find_vq(dev, p9_virtio_intr);
+        chan->in_vq = dev->config->find_vq(dev, 0, p9_virtio_intr);
         if (IS_ERR(chan->in_vq)) {
                 err = PTR_ERR(chan->in_vq);
                 goto free;
         }
 
-        chan->out_vq = dev->config->find_vq(dev, NULL);
+        chan->out_vq = dev->config->find_vq(dev, 1, NULL);
         if (IS_ERR(chan->out_vq)) {
                 err = PTR_ERR(chan->out_vq);
                 goto free_in_vq;