[Patch net-next 2/2] netpoll: use the net namespace of current process instead of init_net

[Cong Wang <amwang@redhat.com>]

From: Cong Wang <amwang@redhat.com>

This will allow us to setup netconsole in a different namespace
rather than where init_net is.

Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
---
 net/core/netpoll.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index a6f39b6..c3b2589 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -1046,11 +1046,16 @@ int netpoll_setup(struct netpoll *np)
 {
 	struct net_device *ndev = NULL;
 	struct in_device *in_dev;
+	struct net *net = &init_net;
+	struct nsproxy *ns = task_nsproxy(current);
 	int err;
 
 	rtnl_lock();
-	if (np->dev_name)
-		ndev = __dev_get_by_name(&init_net, np->dev_name);
+	if (np->dev_name) {
+		if (ns != NULL)
+			net = get_net(ns->net_ns);
+		ndev = __dev_get_by_name(net, np->dev_name);
+	}
 	if (!ndev) {
 		np_err(np, "%s doesn't exist, aborting\n", np->dev_name);
 		err = -ENODEV;
@@ -1159,6 +1164,8 @@ int netpoll_setup(struct netpoll *np)
 put:
 	dev_put(ndev);
 unlock:
+	if (net != &init_net)
+		put_net(net);
 	rtnl_unlock();
 	return err;
 }
-- 
1.7.7.6