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: NMitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> Signed-off-by: NEric 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: NMitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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