commit 61cbc2fca6335be52788773b21efdc52a2750924
author Patrick McHardy <kaber@trash.net> Sat Jun 30 13:35:52 2007 -0700
committer David S. Miller <davem@sunset.davemloft.net> Tue Jul 10 22:16:23 2007 -0700
tree 489e6a9571c7fabd49dcff384dd634635fe66555
parent d62733c8e437fdb58325617c4b3331769ba82d70

[NET]: Fix secondary unicast/multicast address count maintenance

When a reference to an existing address is increased or decreased without
hitting zero, the address count is incorrectly adjusted.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index 7ddf66d..4221dcd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2607,8 +2607,8 @@
 	netif_tx_unlock_bh(dev);
 }
 
-int __dev_addr_delete(struct dev_addr_list **list, void *addr, int alen,
-		      int glbl)
+int __dev_addr_delete(struct dev_addr_list **list, int *count,
+		      void *addr, int alen, int glbl)
 {
 	struct dev_addr_list *da;
 
@@ -2626,13 +2626,15 @@
 
 			*list = da->next;
 			kfree(da);
+			(*count)--;
 			return 0;
 		}
 	}
 	return -ENOENT;
 }
 
-int __dev_addr_add(struct dev_addr_list **list, void *addr, int alen, int glbl)
+int __dev_addr_add(struct dev_addr_list **list, int *count,
+		   void *addr, int alen, int glbl)
 {
 	struct dev_addr_list *da;
 
@@ -2659,6 +2661,7 @@
 	da->da_gusers = glbl ? 1 : 0;
 	da->next = *list;
 	*list = da;
+	(*count)++;
 	return 0;
 }
 
@@ -2692,11 +2695,9 @@
 	ASSERT_RTNL();
 
 	netif_tx_lock_bh(dev);
-	err = __dev_addr_delete(&dev->uc_list, addr, alen, 0);
-	if (!err) {
-		dev->uc_count--;
+	err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
+	if (!err)
 		__dev_set_rx_mode(dev);
-	}
 	netif_tx_unlock_bh(dev);
 	return err;
 }
@@ -2718,11 +2719,9 @@
 	ASSERT_RTNL();
 
 	netif_tx_lock_bh(dev);
-	err = __dev_addr_add(&dev->uc_list, addr, alen, 0);
-	if (!err) {
-		dev->uc_count++;
+	err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
+	if (!err)
 		__dev_set_rx_mode(dev);
-	}
 	netif_tx_unlock_bh(dev);
 	return err;
 }