[PATCH] net: fib: Decrease one unnecessary rt cache flush in fib_disable_ip

[gfree . wind]

From: Gao Feng <f...@ikuai8.com>

The func fib_flush already flushes the rt cache if necessary, so it
is not necessary to invoke rt_cache_flush again in fib_disable_ip.

Signed-off-by: Gao Feng <f...@ikuai8.com>
---
 net/ipv4/fib_frontend.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 5a0e456..39bd1ed 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -1130,7 +1130,8 @@ static void fib_disable_ip(struct net_device *dev, 
unsigned long event,
 {
        if (fib_sync_down_dev(dev, event, force))
                fib_flush(dev_net(dev));
-       rt_cache_flush(dev_net(dev));
+       else
+               rt_cache_flush(dev_net(dev));
        arp_ifdown(dev);
 }
 
-- 
1.9.1