tcfm_dev always points to the correct netdev and we already
hold a refcnt, so no need to use ifindex to lookup again.

If we would support moving target netdev across netns, using
pointer would be better than ifindex.

Cc: Jiri Pirko <redacted>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <redacted>
---
include/net/tc_act/tc_mirred.h | 1 -
net/sched/act_mirred.c         | 3 +--
2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/net/tc_act/tc_mirred.h b/include/net/tc_act/tc_mirred.h
index 21d253c9a8c6..b2dbbfaefd22 100644
--- a/include/net/tc_act/tc_mirred.h
+++ b/include/net/tc_act/tc_mirred.h

@@ -11,7 +11,6 @@ struct tcf_mirred {

	int			tcfm_ifindex;
	bool			tcfm_mac_header_xmit;
	struct net_device __rcu	*tcfm_dev;
-	struct net		*net;
	struct list_head	tcfm_list;
};
#define to_mirred(a) ((struct tcf_mirred *)a)

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 8b3e59388480..fe6489f9c3cf 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c

@@ -140,7 +140,6 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,

	m->tcfm_eaction = parm->eaction;
	if (dev != NULL) {
		m->tcfm_ifindex = parm->ifindex;
-		m->net = net;

		if (ret != ACT_P_CREATED)
			dev_put(rcu_dereference_protected(m->tcfm_dev, 1));
		dev_hold(dev);

@@ -318,7 +317,7 @@ static struct net_device *tcf_mirred_get_dev(const struct tc_action *a)

{
	struct tcf_mirred *m = to_mirred(a);

-	return __dev_get_by_index(m->net, m->tcfm_ifindex);
+	return rtnl_dereference(m->tcfm_dev);
}

static struct tc_action_ops act_mirred_ops = {
-- 
2.13.0