netdev - [patch net-next 6/6] sched: check negative err value to safe one level of indent

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Date:   Thu,  9 Feb 2017 14:39:00 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jhs@...atatu.com, mlxsw@...lanox.com
Subject: [patch net-next 6/6] sched: check negative err value to safe one level of indent

From: Jiri Pirko <jiri@...lanox.com>

As it is more common, check err for !0. That allows to safe one level of
indentation and makes the code easier to read. Also, make 'next' variable
global in function as it is used twice.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 net/sched/cls_api.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 48864ad..abe1fe1 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -214,6 +214,7 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 	struct Qdisc  *q;
 	struct tcf_proto __rcu **back;
 	struct tcf_proto __rcu **chain;
+	struct tcf_proto *next;
 	struct tcf_proto *tp;
 	const struct Qdisc_class_ops *cops;
 	unsigned long cl;
@@ -355,10 +356,8 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 
 	if (fh == 0) {
 		if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
-			struct tcf_proto *next = rtnl_dereference(tp->next);
-
+			next = rtnl_dereference(tp->next);
 			RCU_INIT_POINTER(*back, next);
-
 			tfilter_notify(net, skb, n, tp, fh,
 				       RTM_DELTFILTER, false);
 			tcf_proto_destroy(tp, true);
@@ -383,16 +382,13 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 			break;
 		case RTM_DELTFILTER:
 			err = tp->ops->delete(tp, fh);
-			if (err == 0) {
-				struct tcf_proto *next = rtnl_dereference(tp->next);
-
-				tfilter_notify(net, skb, n, tp,
-					       t->tcm_handle,
-					       RTM_DELTFILTER, false);
-				if (tcf_proto_destroy(tp, false))
-					RCU_INIT_POINTER(*back, next);
-			}
-			goto errout;
+			if (err)
+				goto errout;
+			next = rtnl_dereference(tp->next);
+			tfilter_notify(net, skb, n, tp, t->tcm_handle,
+				       RTM_DELTFILTER, false);
+			if (tcf_proto_destroy(tp, false))
+				RCU_INIT_POINTER(*back, next);
 		case RTM_GETTFILTER:
 			err = tfilter_notify(net, skb, n, tp, fh,
 					     RTM_NEWTFILTER, true);
-- 
2.7.4