netdev - [PATCH net-next 19/19] net/sched: add net device refcount tracker to struct Qdisc

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Date:   Wed,  1 Dec 2021 19:21:39 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 19/19] net/sched: add net device refcount tracker to struct Qdisc

From: Eric Dumazet <edumazet@...gle.com>

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/sch_generic.h | 2 +-
 net/sched/sch_generic.c   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 22179b2fda72a0a1c2fddc07eeda40716a443a46..dbf202bb1a0edad582dbaefe72aac1632e219fbd 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -125,7 +125,7 @@ struct Qdisc {
 	spinlock_t		seqlock;
 
 	struct rcu_head		rcu;
-
+	netdevice_tracker	dev_tracker;
 	/* private data */
 	long privdata[] ____cacheline_aligned;
 };
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index d33804d41c5c5a9047c808fd37ba65ae8875fc79..8c8fbf2e385679e46a1b7af47eeac059fb8468cc 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -973,7 +973,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 	sch->enqueue = ops->enqueue;
 	sch->dequeue = ops->dequeue;
 	sch->dev_queue = dev_queue;
-	dev_hold(dev);
+	dev_hold_track(dev, &sch->dev_tracker, GFP_KERNEL);
 	refcount_set(&sch->refcnt, 1);
 
 	return sch;
@@ -1073,7 +1073,7 @@ static void qdisc_destroy(struct Qdisc *qdisc)
 		ops->destroy(qdisc);
 
 	module_put(ops->owner);
-	dev_put(qdisc_dev(qdisc));
+	dev_put_track(qdisc_dev(qdisc), &qdisc->dev_tracker);
 
 	trace_qdisc_destroy(qdisc);
 
-- 
2.34.0.rc2.393.gf8c9666880-goog