virtio_net: enable VQs early on restore

virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after restore returns, virtio net violated this
rule by using receive VQs within restore.

To fix, call virtio_device_ready before using VQs.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 53031e58a5fc..4e0cbbcd60a7 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1912,6 +1912,8 @@ static int virtnet_restore(struct virtio_device *vdev)
         if (err)
                 return err;
 
+        virtio_device_ready(vdev);
+
         if (netif_running(vi->dev)) {
                 for (i = 0; i < vi->curr_queue_pairs; i++)
                         if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))