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rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlink 

The check 'status & DO_SETLINK_NOTIFY' in do_setlink doesn't really
work after status & DO_SETLINK_MODIFIED, as:

  DO_SETLINK_MODIFIED 0x1
  DO_SETLINK_NOTIFY 0x3

Considering that notifications are suppposed to be sent only when
status have the flag DO_SETLINK_NOTIFY, the right check would be:

  (status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY

This would avoid lots of duplicated notifications when setting some
properties of a link.

Fixes: ba9989069f ("rtnl/do_setlink(): notify when a netdev is modified")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-10-15 18:13:45 +08:00 committed by David S. Miller
parent dc709f3757
commit 64ff90cc2e
1 changed files with 1 additions and 1 deletions
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2
net/core/rtnetlink.c
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@ -2248,7 +2248,7 @@ static int do_setlink(const struct sk_buff *skb,
errout:
if (status & DO_SETLINK_MODIFIED) {
if (status & DO_SETLINK_NOTIFY)
if ((status & DO_SETLINK_NOTIFY) == DO_SETLINK_NOTIFY)
netdev_state_change(dev);
if (err < 0)