netdev - [PATCH 2/1] net: sch: simplify condtion for selecting mini_Qdisc

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Date:   Tue, 26 Oct 2021 13:37:21 -0500
From:   Seth Forshee <seth@...shee.me>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/1] net: sch: simplify condtion for selecting mini_Qdisc_pair buffer

From: Seth Forshee <sforshee@...italocean.com>

The only valid values for a miniq pointer are NULL or a pointer to
miniq1 or miniq2, so testing for miniq_old != &miniq1 is functionally
equivalent to testing that it is NULL or equal to &miniq2.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Seth Forshee <sforshee@...italocean.com>
---
 net/sched/sch_generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 24899efc51be..3b0f62095803 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -1500,7 +1500,7 @@ void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
 	if (!tp_head) {
 		RCU_INIT_POINTER(*miniqp->p_miniq, NULL);
 	} else {
-		miniq = !miniq_old || miniq_old == &miniqp->miniq2 ?
+		miniq = miniq_old != &miniqp->miniq1 ?
 			&miniqp->miniq1 : &miniqp->miniq2;
 
 		/* We need to make sure that readers won't see the miniq
-- 
2.30.2