linux-kernel - [PATCH net-next 4/5] net/sched: taprio: delete misleading comment about preallocating child qdiscs

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Date:   Wed, 31 May 2023 20:39:27 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
        Peilin Ye <yepeilin.cs@...il.com>,
        Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next 4/5] net/sched: taprio: delete misleading comment about preallocating child qdiscs

As mentioned in commit af7b29b1deaa ("Revert "net/sched: taprio: make
qdisc_leaf() see the per-netdev-queue pfifo child qdiscs"") - unlike
mqprio, taprio doesn't use q->qdiscs[] only as a temporary transport
between Qdisc_ops :: init() and Qdisc_ops :: attach().

Delete the comment, which is just stolen from mqprio, but there, the
usage patterns are a lot different, and this is nothing but confusing.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/sched/sch_taprio.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 263306fe38d8..cc7ff98e5e86 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -2084,11 +2084,8 @@ static int taprio_init(struct Qdisc *sch, struct nlattr *opt,
 		return -EOPNOTSUPP;
 	}
 
-	/* pre-allocate qdisc, attachment can't fail */
-	q->qdiscs = kcalloc(dev->num_tx_queues,
-			    sizeof(q->qdiscs[0]),
+	q->qdiscs = kcalloc(dev->num_tx_queues, sizeof(q->qdiscs[0]),
 			    GFP_KERNEL);
-
 	if (!q->qdiscs)
 		return -ENOMEM;
 
-- 
2.34.1