[Patch net-nnext] net_sched: add missing tcf_lock for act_connmark

[Cong Wang]

According to the new locking rule, we have to take tcf_lock
for both ->init() and ->dump(), as RTNL will be removed.
However, it is missing for act_connmark.

Cc: Vlad Buslov <vla...@mellanox.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 net/sched/act_connmark.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
index e869c0ee63c8..8475913f2070 100644
--- a/net/sched/act_connmark.c
+++ b/net/sched/act_connmark.c
@@ -143,8 +143,10 @@ static int tcf_connmark_init(struct net *net, struct 
nlattr *nla,
                        return -EEXIST;
                }
                /* replacing action and zone */
+               spin_lock_bh(&ci->tcf_lock);
                ci->tcf_action = parm->action;
                ci->zone = parm->zone;
+               spin_unlock_bh(&ci->tcf_lock);
                ret = 0;
        }
 
@@ -156,16 +158,16 @@ static inline int tcf_connmark_dump(struct sk_buff *skb, 
struct tc_action *a,
 {
        unsigned char *b = skb_tail_pointer(skb);
        struct tcf_connmark_info *ci = to_connmark(a);
-
        struct tc_connmark opt = {
                .index   = ci->tcf_index,
                .refcnt  = refcount_read(&ci->tcf_refcnt) - ref,
                .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
-               .action  = ci->tcf_action,
-               .zone   = ci->zone,
        };
        struct tcf_t t;
 
+       spin_lock_bh(&ci->tcf_lock);
+       opt.action = ci->tcf_action;
+       opt.zone = ci->zone;
        if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
                goto nla_put_failure;
 
@@ -173,9 +175,12 @@ static inline int tcf_connmark_dump(struct sk_buff *skb, 
struct tc_action *a,
        if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
                          TCA_CONNMARK_PAD))
                goto nla_put_failure;
+       spin_unlock_bh(&ci->tcf_lock);
 
        return skb->len;
+
 nla_put_failure:
+       spin_unlock_bh(&ci->tcf_lock);
        nlmsg_trim(skb, b);
        return -1;
 }
-- 
2.14.4