static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 {
        struct net_device_context *net_device_ctx = netdev_priv(net);
-       struct netvsc_driver *net_drv_obj =
-               drv_to_netvscdrv(net_device_ctx->device_ctx->device.driver);
        struct hv_netvsc_packet *packet;
        int ret;
        unsigned int i, num_pages;
        /* Allocate a netvsc packet based on # of frags. */
        packet = kzalloc(sizeof(struct hv_netvsc_packet) +
                         (num_pages * sizeof(struct hv_page_buffer)) +
-                        net_drv_obj->req_ext_size, GFP_ATOMIC);
+                        sizeof(struct rndis_filter_packet), GFP_ATOMIC);
        if (!packet) {
                /* out of memory, silently drop packet */
                netdev_err(net, "unable to allocate hv_netvsc_packet\n");