[NET]: Avoid duplicate netlink notification when changing link state
When changing the link state from userspace not affecting any other
flags. Two duplicate notification are being sent, once as action
in the NETDEV_UP/NETDEV_DOWN notification chain and a second time
when comparing old and new device flags after the change has been
completed. Although harmless, the duplicates should be avoided.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index 5a7f20f..2609062 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2577,7 +2577,7 @@
int dev_change_flags(struct net_device *dev, unsigned flags)
{
- int ret;
+ int ret, changes;
int old_flags = dev->flags;
/*
@@ -2632,8 +2632,10 @@
dev_set_allmulti(dev, inc);
}
- if (old_flags ^ dev->flags)
- rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
+ /* Exclude state transition flags, already notified */
+ changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
+ if (changes)
+ rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
return ret;
}