netdev: Add addr_list_lock to struct net_device.

This will be used to protect the per-device unicast and multicast
address lists, as well as the callbacks into the drivers which
configure such state such as ->set_rx_mode() and ->set_multicast_list().

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ba5c4639ea91..fd0365219181 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -609,6 +609,7 @@ struct net_device
         unsigned char           addr_len;       /* hardware address length      */
         unsigned short          dev_id;         /* for shared network cards */
 
+        spinlock_t              addr_list_lock;
         struct dev_addr_list    *uc_list;       /* Secondary unicast mac addresses */
         int                     uc_count;       /* Number of installed ucasts   */
         int                     uc_promisc;
diff --git a/net/core/dev.c b/net/core/dev.c
index feaab4898a5b..d933d1bfa6fa 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3836,6 +3836,7 @@ int register_netdevice(struct net_device *dev)
         BUG_ON(!dev_net(dev));
         net = dev_net(dev);
 
+        spin_lock_init(&dev->addr_list_lock);
         netdev_init_queue_locks(dev);
 
         dev->iflink = -1;