[NET]: move dev_mc_discard from dev_mcast.c to dev.c

Because this function is only called by unregister_netdevice,
this moving could make this non-global function static,
and also remove its declaration in netdevice.h;

Any further, function __dev_addr_discard is also just called by
dev_mc_discard and dev_unicast_discard, keeping this two functions
both in one c file could make __dev_addr_discard also static
and remove its declaration in netdevice.h;

Futhermore, the sequential call to dev_unicast_discard and then
dev_mc_discard in unregister_netdevice have a similar mechanism that:
(netif_tx_lock_bh / __dev_addr_discard / netif_tx_unlock_bh),
they should merged into one to eliminate duplicates in acquiring and
releasing the dev->_xmit_lock, this would be done in my following patch.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 13 insertions, 15 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index da7a13c97eb8..9820ca1e45e2 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1098,10 +1098,8 @@ extern int 		dev_mc_delete(struct net_device *dev, void *addr, int alen, int all
 extern int              dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
 extern int              dev_mc_sync(struct net_device *to, struct net_device *from);
 extern void             dev_mc_unsync(struct net_device *to, struct net_device *from);
-extern void             dev_mc_discard(struct net_device *dev);
 extern int              __dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
 extern int              __dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
-extern void             __dev_addr_discard(struct dev_addr_list **list);
 extern void             dev_set_promiscuity(struct net_device *dev, int inc);
 extern void             dev_set_allmulti(struct net_device *dev, int inc);
 extern void             netdev_state_change(struct net_device *dev);
diff --git a/net/core/dev.c b/net/core/dev.c
index 13a0d9f6da54..3ba63aaa3001 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2715,7 +2715,7 @@ int __dev_addr_add(struct dev_addr_list **list, int *count,
         return 0;
 }
 
-void __dev_addr_discard(struct dev_addr_list **list)
+static void __dev_addr_discard(struct dev_addr_list **list)
 {
         struct dev_addr_list *tmp;
 
@@ -2785,6 +2785,18 @@ static void dev_unicast_discard(struct net_device *dev)
         netif_tx_unlock_bh(dev);
 }
 
+/*
+ *      Discard multicast list when a device is downed
+ */
+
+static void dev_mc_discard(struct net_device *dev)
+{
+        netif_tx_lock_bh(dev);
+        __dev_addr_discard(&dev->mc_list);
+        dev->mc_count = 0;
+        netif_tx_unlock_bh(dev);
+}
+
 unsigned dev_get_flags(const struct net_device *dev)
 {
         unsigned flags;
diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c
index 235a2a8a0d05..99aece1aeccf 100644
--- a/net/core/dev_mcast.c
+++ b/net/core/dev_mcast.c
@@ -177,18 +177,6 @@ void dev_mc_unsync(struct net_device *to, struct net_device *from)
 }
 EXPORT_SYMBOL(dev_mc_unsync);
 
-/*
- *      Discard multicast list when a device is downed
- */
-
-void dev_mc_discard(struct net_device *dev)
-{
-        netif_tx_lock_bh(dev);
-        __dev_addr_discard(&dev->mc_list);
-        dev->mc_count = 0;
-        netif_tx_unlock_bh(dev);
-}
-
 #ifdef CONFIG_PROC_FS
 static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
 {