From 3c23f9adda4ed31b074dfd4a4d86cbc5fe77f9e3 Mon Sep 17 00:00:00 2001
From: Zhengchao Shao <shaozhengchao@huawei.com>
Date: Wed, 24 Aug 2022 08:52:31 +0800
Subject: [PATCH] net: sched: delete duplicate cleanup of backlog and qlen

[ Upstream commit c19d893fbf3f2f8fa864ae39652c7fee939edde2 ]

qdisc_reset() is clearing qdisc->q.qlen and qdisc->qstats.backlog
_after_ calling qdisc->ops->reset. There is no need to clear them
again in the specific reset function.

Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20220824005231.345727-1-shaozhengchao@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Stable-dep-of: 2a3fc78210b9 ("net: sched: sfb: fix null pointer access issue when sfb_init() fails")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/net/sch_generic.h | 1 -
 net/sched/sch_atm.c       | 1 -
 net/sched/sch_cbq.c       | 1 -
 net/sched/sch_choke.c     | 2 --
 net/sched/sch_drr.c       | 2 --
 net/sched/sch_dsmark.c    | 2 --
 net/sched/sch_etf.c       | 3 ---
 net/sched/sch_ets.c       | 2 --
 net/sched/sch_fq_codel.c  | 2 --
 net/sched/sch_fq_pie.c    | 3 ---
 net/sched/sch_hfsc.c      | 2 --
 net/sched/sch_htb.c       | 2 --
 net/sched/sch_multiq.c    | 1 -
 net/sched/sch_prio.c      | 2 --
 net/sched/sch_qfq.c       | 2 --
 net/sched/sch_red.c       | 2 --
 net/sched/sch_sfb.c       | 2 --
 net/sched/sch_skbprio.c   | 3 ---
 net/sched/sch_taprio.c    | 2 --
 net/sched/sch_tbf.c       | 2 --
 net/sched/sch_teql.c      | 1 -
 21 files changed, 40 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index ec693fe7c5539..f2958fb5ae08b 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -1137,7 +1137,6 @@ static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
 static inline void qdisc_reset_queue(struct Qdisc *sch)
 {
 	__qdisc_reset_queue(&sch->q);
-	sch->qstats.backlog = 0;
 }
 
 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 4c8e994cf0a53..816fd0d7ba38a 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -577,7 +577,6 @@ static void atm_tc_reset(struct Qdisc *sch)
 	pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 	list_for_each_entry(flow, &p->flows, list)
 		qdisc_reset(flow->q);
-	sch->q.qlen = 0;
 }
 
 static void atm_tc_destroy(struct Qdisc *sch)
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 91a0dc463c482..ba99ce05cd527 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -975,7 +975,6 @@ cbq_reset(struct Qdisc *sch)
 			cl->cpriority = cl->priority;
 		}
 	}
-	sch->q.qlen = 0;
 }
 
 
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 2adbd945bf15a..25d2daaa81227 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -315,8 +315,6 @@ static void choke_reset(struct Qdisc *sch)
 		rtnl_qdisc_drop(skb, sch);
 	}
 
-	sch->q.qlen = 0;
-	sch->qstats.backlog = 0;
 	if (q->tab)
 		memset(q->tab, 0, (q->tab_mask + 1) * sizeof(struct sk_buff *));
 	q->head = q->tail = 0;
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 18e4f7a0b2912..4e5b1cf11b858 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -441,8 +441,6 @@ static void drr_reset_qdisc(struct Qdisc *sch)
 			qdisc_reset(cl->qdisc);
 		}
 	}
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static void drr_destroy_qdisc(struct Qdisc *sch)
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index 4c100d1052699..7da6dc38a3828 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -409,8 +409,6 @@ static void dsmark_reset(struct Qdisc *sch)
 	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
 	if (p->q)
 		qdisc_reset(p->q);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static void dsmark_destroy(struct Qdisc *sch)
diff --git a/net/sched/sch_etf.c b/net/sched/sch_etf.c
index c48f91075b5c6..d96103b0e2bf5 100644
--- a/net/sched/sch_etf.c
+++ b/net/sched/sch_etf.c
@@ -445,9 +445,6 @@ static void etf_reset(struct Qdisc *sch)
 	timesortedlist_clear(sch);
 	__qdisc_reset_queue(&sch->q);
 
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
-
 	q->last = 0;
 }
 
diff --git a/net/sched/sch_ets.c b/net/sched/sch_ets.c
index d733934935533..8de4365886e84 100644
--- a/net/sched/sch_ets.c
+++ b/net/sched/sch_ets.c
@@ -727,8 +727,6 @@ static void ets_qdisc_reset(struct Qdisc *sch)
 	}
 	for (band = 0; band < q->nbands; band++)
 		qdisc_reset(q->classes[band].qdisc);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static void ets_qdisc_destroy(struct Qdisc *sch)
diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 839e1235db053..23a042adb74d8 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -347,8 +347,6 @@ static void fq_codel_reset(struct Qdisc *sch)
 		codel_vars_init(&flow->cvars);
 	}
 	memset(q->backlogs, 0, q->flows_cnt * sizeof(u32));
-	sch->q.qlen = 0;
-	sch->qstats.backlog = 0;
 	q->memory_usage = 0;
 }
 
diff --git a/net/sched/sch_fq_pie.c b/net/sched/sch_fq_pie.c
index d6aba6edd16e5..35c35465226bd 100644
--- a/net/sched/sch_fq_pie.c
+++ b/net/sched/sch_fq_pie.c
@@ -521,9 +521,6 @@ static void fq_pie_reset(struct Qdisc *sch)
 		INIT_LIST_HEAD(&flow->flowchain);
 		pie_vars_init(&flow->vars);
 	}
-
-	sch->q.qlen = 0;
-	sch->qstats.backlog = 0;
 }
 
 static void fq_pie_destroy(struct Qdisc *sch)
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index d3979a6000e7d..03efc40e42fc4 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1484,8 +1484,6 @@ hfsc_reset_qdisc(struct Qdisc *sch)
 	}
 	q->eligible = RB_ROOT;
 	qdisc_watchdog_cancel(&q->watchdog);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static void
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 23a9d6242429f..cb5872d22ecf4 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1008,8 +1008,6 @@ static void htb_reset(struct Qdisc *sch)
 	}
 	qdisc_watchdog_cancel(&q->watchdog);
 	__qdisc_reset_queue(&q->direct_queue);
-	sch->q.qlen = 0;
-	sch->qstats.backlog = 0;
 	memset(q->hlevel, 0, sizeof(q->hlevel));
 	memset(q->row_mask, 0, sizeof(q->row_mask));
 }
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index cd8ab90c4765d..f28050c7f12d6 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -152,7 +152,6 @@ multiq_reset(struct Qdisc *sch)
 
 	for (band = 0; band < q->bands; band++)
 		qdisc_reset(q->queues[band]);
-	sch->q.qlen = 0;
 	q->curband = 0;
 }
 
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 3b8d7197c06bf..c03a11dd990f4 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -135,8 +135,6 @@ prio_reset(struct Qdisc *sch)
 
 	for (prio = 0; prio < q->bands; prio++)
 		qdisc_reset(q->queues[prio]);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static int prio_offload(struct Qdisc *sch, struct tc_prio_qopt *qopt)
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index d4ce58c90f9fb..13246a9dc5c1c 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -1458,8 +1458,6 @@ static void qfq_reset_qdisc(struct Qdisc *sch)
 			qdisc_reset(cl->qdisc);
 		}
 	}
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static void qfq_destroy_qdisc(struct Qdisc *sch)
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 40adf1f07a82d..f1e013e3f04a9 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -176,8 +176,6 @@ static void red_reset(struct Qdisc *sch)
 	struct red_sched_data *q = qdisc_priv(sch);
 
 	qdisc_reset(q->qdisc);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 	red_restart(&q->vars);
 }
 
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index 2829455211f8c..1be8d04d69dc8 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -456,8 +456,6 @@ static void sfb_reset(struct Qdisc *sch)
 	struct sfb_sched_data *q = qdisc_priv(sch);
 
 	qdisc_reset(q->qdisc);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 	q->slot = 0;
 	q->double_buffering = false;
 	sfb_zero_all_buckets(q);
diff --git a/net/sched/sch_skbprio.c b/net/sched/sch_skbprio.c
index 7a5e4c4547156..df72fb83d9c7d 100644
--- a/net/sched/sch_skbprio.c
+++ b/net/sched/sch_skbprio.c
@@ -213,9 +213,6 @@ static void skbprio_reset(struct Qdisc *sch)
 	struct skbprio_sched_data *q = qdisc_priv(sch);
 	int prio;
 
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
-
 	for (prio = 0; prio < SKBPRIO_MAX_PRIORITY; prio++)
 		__skb_queue_purge(&q->qdiscs[prio]);
 
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 86675a79da1e4..5bffc37022e0b 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -1638,8 +1638,6 @@ static void taprio_reset(struct Qdisc *sch)
 			if (q->qdiscs[i])
 				qdisc_reset(q->qdiscs[i]);
 	}
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 }
 
 static void taprio_destroy(struct Qdisc *sch)
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 36079fdde2cb5..e031c1a41ea6b 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -330,8 +330,6 @@ static void tbf_reset(struct Qdisc *sch)
 	struct tbf_sched_data *q = qdisc_priv(sch);
 
 	qdisc_reset(q->qdisc);
-	sch->qstats.backlog = 0;
-	sch->q.qlen = 0;
 	q->t_c = ktime_get_ns();
 	q->tokens = q->buffer;
 	q->ptokens = q->mtu;
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index 6af6b95bdb672..79aaab51cbf5c 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -124,7 +124,6 @@ teql_reset(struct Qdisc *sch)
 	struct teql_sched_data *dat = qdisc_priv(sch);
 
 	skb_queue_purge(&dat->q);
-	sch->q.qlen = 0;
 }
 
 static void