Packet flow in bottom half

I was reading about packet flow in the receive path from NIC interrupt handler to user space.

I wanted to know till which point does the newly allocated skbuff remain in bottom half context.

Taking the snull_rx() code from LDD:

void snull_rx(struct net_device *dev, struct snull_packet *pkt)
{
    struct sk_buff *skb;
    struct snull_priv *priv = netdev_priv(dev);

    /*
     * The packet has been retrieved from the transmission
     * medium. Build an skb around it, so upper layers can handle it
     */
    skb = dev_alloc_skb(pkt->datalen + 2);
    if (!skb) {
        if (printk_ratelimit(  ))
            printk(KERN_NOTICE "snull rx: low on mem - packet dropped\n");
        priv->stats.rx_dropped++;
        goto out;
    }
    memcpy(skb_put(skb, pkt->datalen), pkt->data, pkt->datalen);

    /* Write metadata, and then pass to the receive level */
    skb->dev = dev;
    skb->protocol = eth_type_trans(skb, dev);
    skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
    priv->stats.rx_packets++;
    priv->stats.rx_bytes += pkt->datalen;
    netif_rx(skb);
  out:
    return;
}

So after the netif_rx(skb) till what point will the skb remain in bottom half ?.

Thanks.