[RFC PATCH net-next 4/4] cls_cgroup: restore classid from skb->sk_classid

[Libo Chen]

if skb->sk is NULL, we can try to restore from skb->bk_classid,
because we may have saved it.

Signed-off-by: Libo Chen <clbchenlibo.chen@xxxxxxxxxx>
---
 net/sched/cls_cgroup.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index d228a5d..6ab0e69 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -141,9 +141,10 @@ static int cls_cgroup_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 	 */
 	if (in_serving_softirq()) {
 		/* If there is an sk_classid we'll use that. */
-		if (!skb->sk)
-			return -1;
-		classid = skb->sk->sk_classid;
+		if (skb->sk)
+			classid = skb->sk->sk_classid;
+		else
+			classid = skb->backup_classid;
 	}

 	if (!classid)
-- 
1.8.2.2


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