From 814e3c10474fd28840d5fcbbb9224b396807cbb2 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Mon, 18 Apr 2011 03:54:45 +0200
Subject: Shut down the socket before unregistering the device

---
 quicktun.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/quicktun.c b/quicktun.c
index f24e25d..4bc7557 100644
--- a/quicktun.c
+++ b/quicktun.c
@@ -50,7 +50,7 @@ static netdev_tx_t quicktun_net_xmit(struct sk_buff *skb, struct net_device *dev
 	if (tun->remote_address.sin_addr.s_addr) {
 		err = skb_linearize(skb);
 		if (err < 0)
-			goto drop;
+			goto error;
 
 		vec.iov_base = skb->data;
 		vec.iov_len = skb->len;
@@ -67,16 +67,16 @@ static netdev_tx_t quicktun_net_xmit(struct sk_buff *skb, struct net_device *dev
 		tun->dev->stats.tx_bytes += skb->len;
 	}
 	else
-		goto drop;
+		goto error;
 
 	consume_skb(skb);
 
 	return NETDEV_TX_OK;
 
- drop:
+error:
 	kfree_skb(skb);
 
-	tun->dev->stats.tx_dropped++;
+	tun->dev->stats.tx_errors++;
 	return NETDEV_TX_OK;
 }
 
@@ -88,8 +88,11 @@ static void quicktun_udp_data_ready(struct sock *sk, int bytes)
 	int err;
 
 
+	read_lock(&sk->sk_callback_lock);
+
 	skb = skb_recv_datagram(sk, 0, 1, &err);
 	if (!skb) {
+		read_unlock(&sk->sk_callback_lock);
 		if (err == -EAGAIN)
 			return;
 		pr_info("Quicktun: UDP socket error %d", err);
@@ -138,13 +141,17 @@ static void quicktun_udp_data_ready(struct sock *sk, int bytes)
 		goto drop;
 	}
 
+	read_unlock(&sk->sk_callback_lock);
+
 	netif_rx_ni(skb);
 
 	tun->dev->stats.rx_packets++;
 	tun->dev->stats.rx_bytes += len;
 	return;
 
- drop:
+drop:
+	read_unlock(&sk->sk_callback_lock);
+
 	tun->dev->stats.rx_dropped++;
 	kfree_skb(skb);
 }
@@ -259,7 +266,7 @@ static int quicktun_socket_init(struct net_device *dev)
 		goto error;
 
 	return 0;
- error:
+error:
 	sock_release(tun->sock);
 	return err;
 }
@@ -347,11 +354,11 @@ static int quicktun_cmd_create_device(struct sk_buff *skb, struct genl_info *inf
 
 	return 0;
 
- err_free_sk:
+err_free_sk:
 	rtnl_unlock();
 	sock_release(tun->sock);
 
- err_free_dev:
+err_free_dev:
 	free_netdev(dev);
 	return err;
 }
@@ -361,6 +368,8 @@ static void __quicktun_delete_device(struct net_device *dev) {
 	struct quicktun_struct *tun = netdev_priv(dev);
 	struct socket *sock = tun->sock;
 
+	kernel_sock_shutdown(sock, SHUT_RD);
+
 	list_del(&tun->list);
 
 	unregister_netdevice(dev);
@@ -401,7 +410,7 @@ static int quicktun_cmd_delete_device(struct sk_buff *skb, struct genl_info *inf
 
 	return 0;
 
- err_unlock:
+err_unlock:
 	rtnl_unlock();
 
 	return err;
-- 
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