From 7c355f532dd43036622e1880c114773463bafd23 Mon Sep 17 00:00:00 2001 From: Thomas Graf Date: Tue, 5 Jun 2007 16:03:03 -0700 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- net/core/dev.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 5a7f20f78574..26090621ea6b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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; } -- GitLab