linux-kernel - [PATCH net-next,v2 1/2] net: sched: fq_codel: remove redundant resource cleanup in fq_codel

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Message-ID: <20220902083430.24378-2-shaozhengchao@huawei.com>
Date:   Fri, 2 Sep 2022 16:34:29 +0800
From:   Zhengchao Shao <shaozhengchao@...wei.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <jhs@...atatu.com>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>
CC:     <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>,
        <shaozhengchao@...wei.com>
Subject: [PATCH net-next,v2 1/2] net: sched: fq_codel: remove redundant resource cleanup in fq_codel_init()

If fq_codel_init() fails, qdisc_create() invokes fq_codel_destroy() to
clear resources. Therefore, remove redundant resource cleanup in
fq_codel_init().

Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
v1: rebase
---
 net/sched/sch_fq_codel.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 23a042adb74d..f97b2adb0a44 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -481,26 +481,24 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt,
 	if (opt) {
 		err = fq_codel_change(sch, opt, extack);
 		if (err)
-			goto init_failure;
+			return err;
 	}
 
 	err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
 	if (err)
-		goto init_failure;
+		return err;
 
 	if (!q->flows) {
 		q->flows = kvcalloc(q->flows_cnt,
 				    sizeof(struct fq_codel_flow),
 				    GFP_KERNEL);
-		if (!q->flows) {
-			err = -ENOMEM;
-			goto init_failure;
-		}
+		if (!q->flows)
+			return -ENOMEM;
+
 		q->backlogs = kvcalloc(q->flows_cnt, sizeof(u32), GFP_KERNEL);
-		if (!q->backlogs) {
-			err = -ENOMEM;
-			goto alloc_failure;
-		}
+		if (!q->backlogs)
+			return -ENOMEM;
+
 		for (i = 0; i < q->flows_cnt; i++) {
 			struct fq_codel_flow *flow = q->flows + i;
 
@@ -513,13 +511,6 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt,
 	else
 		sch->flags &= ~TCQ_F_CAN_BYPASS;
 	return 0;
-
-alloc_failure:
-	kvfree(q->flows);
-	q->flows = NULL;
-init_failure:
-	q->flows_cnt = 0;
-	return err;
 }
 
 static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb)
-- 
2.17.1