From: Jiri Pirko <jiri@mellanox.com>
Date: Fri, 4 Aug 2017 14:29:13 +0200
Subject: net: sched: cls_route: no need to call tcf_exts_change for newly
 allocated struct
Patch-mainline: v4.14-rc1
Git-commit: 8c98d571bb0e9717fd7be7242945e8e0abebbaa3
References: bsc#1109837

As the f struct was allocated right before route4_set_parms call,
no need to use tcf_exts_change to do atomic change, and we can just
fill-up the unused exts struct directly by tcf_exts_validate.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/sched/cls_route.c |   30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -372,37 +372,32 @@ static int route4_set_parms(struct net *
 	struct route4_filter *fp;
 	unsigned int h1;
 	struct route4_bucket *b;
-	struct tcf_exts e;
 	int err;
 
-	err = tcf_exts_init(&e, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
 	if (err < 0)
 		return err;
-	err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
-	if (err < 0)
-		goto errout;
 
-	err = -EINVAL;
 	if (tb[TCA_ROUTE4_TO]) {
 		if (new && handle & 0x8000)
-			goto errout;
+			return -EINVAL;
 		to = nla_get_u32(tb[TCA_ROUTE4_TO]);
 		if (to > 0xFF)
-			goto errout;
+			return -EINVAL;
 		nhandle = to;
 	}
 
 	if (tb[TCA_ROUTE4_FROM]) {
 		if (tb[TCA_ROUTE4_IIF])
-			goto errout;
+			return -EINVAL;
 		id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
 		if (id > 0xFF)
-			goto errout;
+			return -EINVAL;
 		nhandle |= id << 16;
 	} else if (tb[TCA_ROUTE4_IIF]) {
 		id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
 		if (id > 0x7FFF)
-			goto errout;
+			return -EINVAL;
 		nhandle |= (id | 0x8000) << 16;
 	} else
 		nhandle |= 0xFFFF << 16;
@@ -410,27 +405,25 @@ static int route4_set_parms(struct net *
 	if (handle && new) {
 		nhandle |= handle & 0x7F00;
 		if (nhandle != handle)
-			goto errout;
+			return -EINVAL;
 	}
 
 	h1 = to_hash(nhandle);
 	b = rtnl_dereference(head->table[h1]);
 	if (!b) {
-		err = -ENOBUFS;
 		b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
 		if (b == NULL)
-			goto errout;
+			return -ENOBUFS;
 
 		rcu_assign_pointer(head->table[h1], b);
 	} else {
 		unsigned int h2 = from_hash(nhandle >> 16);
 
-		err = -EEXIST;
 		for (fp = rtnl_dereference(b->ht[h2]);
 		     fp;
 		     fp = rtnl_dereference(fp->next))
 			if (fp->handle == f->handle)
-				goto errout;
+				return -EEXIST;
 	}
 
 	if (tb[TCA_ROUTE4_TO])
@@ -450,12 +443,7 @@ static int route4_set_parms(struct net *
 		tcf_bind_filter(tp, &f->res, base);
 	}
 
-	tcf_exts_change(tp, &f->exts, &e);
-
 	return 0;
-errout:
-	tcf_exts_destroy(&e);
-	return err;
 }
 
 static int route4_change(struct net *net, struct sk_buff *in_skb,