netdev: introduce dev_get_stats()

In order for the network device ops get_stats call to be immutable, the handling
of the default internal network device stats block has to be changed. Add a new
helper function which replaces the old use of internal_get_stats.

Note: change return code to make it clear that the caller should not
go changing the returned statistics.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 6f8e0778e565..790dd205bb5d 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -551,7 +551,7 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
 }
 
 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
-                                 struct net_device_stats *b)
+                                 const struct net_device_stats *b)
 {
         a->rx_packets = b->rx_packets;
         a->tx_packets = b->tx_packets;
@@ -609,7 +609,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
         struct netdev_queue *txq;
         struct ifinfomsg *ifm;
         struct nlmsghdr *nlh;
-        struct net_device_stats *stats;
+        const struct net_device_stats *stats;
         struct nlattr *attr;
 
         nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
@@ -666,7 +666,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
         if (attr == NULL)
                 goto nla_put_failure;
 
-        stats = dev->get_stats(dev);
+        stats = dev_get_stats(dev);
         copy_rtnl_link_stats(nla_data(attr), stats);
 
         if (dev->rtnl_link_ops) {