netdev - [PATCH 2/2] loopback: bringup 'lo' by default at initialization

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Date:   Tue,  4 Jul 2017 12:16:23 -0700
From:   Mahesh Bandewar <mahesh@...dewar.net>
To:     James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Biederman <ebiederm@...ssion.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        Mahesh Bandewar <maheshb@...gle.com>
Subject: [PATCH 2/2] loopback: bringup 'lo' by default at initialization

From: Mahesh Bandewar <maheshb@...gle.com>

loopback devices are always brought up right after its initialization
including the case of network namespace creation. e.g.

    ip netns add foo
    ip -netns foo link set lo up

This patch will eliminate the need to do that separately and would bring
it up as part of the loopback initialization.

Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
---
 drivers/net/loopback.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 30612497643c..3216977935d1 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -217,6 +217,12 @@ static __net_init int loopback_net_init(struct net *net)
 
 	BUG_ON(dev->ifindex != LOOPBACK_IFINDEX);
 	net->loopback_dev = dev;
+
+	/* Set the loopback device UP */
+	rtnl_lock();
+	dev_open(net->loopback_dev);
+	rtnl_unlock();
+
 	return 0;
 
 out_free_netdev:
-- 
2.13.2.725.g09c95d1e9-goog