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, 1 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9060f5f3517a..981a089d5149 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -865,8 +865,8 @@ struct net_device
 #ifdef CONFIG_NET_POLL_CONTROLLER
                 void                    (*poll_controller)(struct net_device *dev);
 #endif
-#endif
         };
+#endif
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)
 
@@ -1780,6 +1780,8 @@ extern void		netdev_features_change(struct net_device *dev);
 /* Load a device via the kmod */
 extern void             dev_load(struct net *net, const char *name);
 extern void             dev_mcast_init(void);
+extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
+
 extern int              netdev_max_backlog;
 extern int              weight_p;
 extern int              netdev_set_master(struct net_device *dev, struct net_device *master);