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[NET]: Avoid duplicate netlink notification when changing link state

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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>
This commit is contained in:
Thomas Graf 2007-06-05 16:03:03 -07:00 committed by David S. Miller
parent df2bc459a3
commit 7c355f532d
1 changed files with 5 additions and 3 deletions
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8
net/core/dev.c
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@ -2577,7 +2577,7 @@ unsigned dev_get_flags(const struct net_device *dev)
int dev_change_flags(struct net_device *dev, unsigned flags)
{
int ret;
int ret, changes;
int old_flags = dev->flags;
/*
@ -2632,8 +2632,10 @@ int dev_change_flags(struct net_device *dev, unsigned flags)
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;
}