net: linkwatch: allow vlans to get carrier changes faster
authorEric Dumazet <eric.dumazet@gmail.com>
Tue, 30 Aug 2011 23:31:58 +0000 (23:31 +0000)
committerDavid S. Miller <davem@davemloft.net>
Thu, 15 Sep 2011 19:36:34 +0000 (15:36 -0400)
commitc37e0c993055d8c4fd82202331d06e6ef9bfec4b
tree6145e674eef915ec15f605646be59c4b9ff4852b
parent3e829a784c16513ac9a1d29ad23d7753d8f40b79
net: linkwatch: allow vlans to get carrier changes faster

There is a time-lag of IFF_RUNNING flag consistency between vlan and
real devices when the real devices are in problem such as link or cable
broken.

This leads to a degradation of Availability such as a delay of failover
in HA systems using vlan since the detection of the problem at real
device is delayed.

We can avoid the linkwatch delay (~1 sec) for devices linked to another
ones, since delay is already done for the realdev.

Based on a previous patch from Mitsuo Hayasaka

Reported-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Patrick McHardy <kaber@trash.net>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: Tom Herbert <therbert@google.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Jesse Gross <jesse@nicira.com>
Tested-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/link_watch.c