netdev - [PATCH net-next v2 2/5] net: sched: prefer qdisc_is

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Message-Id: <a62aee818a5e53b8e7691fb9579793a66e41f2d5.1554892007.git.pabeni@redhat.com>
Date:   Wed, 10 Apr 2019 14:32:38 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Eric Dumazet <edumazet@...gle.com>,
        Ivan Vecera <ivecera@...hat.com>
Subject: [PATCH net-next v2 2/5] net: sched: prefer qdisc_is_empty() over direct qlen access

When checking for root qdisc queue length, do not access directly q.qlen.
In the following patches we will move back qlen accounting to per CPU
values for NOLOCK qdiscs.

Instead, prefer the qdisc_is_empty() helper usage.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 include/net/sch_generic.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 0aea0e262452..7ecb6127e980 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -747,7 +747,7 @@ static inline bool qdisc_all_tx_empty(const struct net_device *dev)
 		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 		const struct Qdisc *q = rcu_dereference(txq->qdisc);
 
-		if (q->q.qlen) {
+		if (!qdisc_is_empty(q)) {
 			rcu_read_unlock();
 			return false;
 		}
-- 
2.20.1