netdev - [PATCH v2 net-next 05/23] net: add net device refcount tracker to struct netdev

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Message-Id: <20211203024640.1180745-6-eric.dumazet@gmail.com>
Date:   Thu,  2 Dec 2021 18:46:22 -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>,
        Eric Dumazet <edumazet@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v2 net-next 05/23] net: add net device refcount tracker to struct netdev_queue

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

This will help debugging pesky netdev reference leaks.

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

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5bda48d81240e010bffb1cfa96e7a84c733a919a..3223f7db128de3a7353e6d50255c01ccf6c90ba7 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -586,6 +586,8 @@ struct netdev_queue {
  * read-mostly part
  */
 	struct net_device	*dev;
+	netdevice_tracker	dev_tracker;
+
 	struct Qdisc __rcu	*qdisc;
 	struct Qdisc		*qdisc_sleeping;
 #ifdef CONFIG_SYSFS
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 27a7ac2e516f65dbfdb2a2319e6faa27c7dd8f31..3b2cdbbdc858e06fb0a482a9b7fc778e501ba1e0 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1607,7 +1607,7 @@ static void netdev_queue_release(struct kobject *kobj)
 	struct netdev_queue *queue = to_netdev_queue(kobj);
 
 	memset(kobj, 0, sizeof(*kobj));
-	dev_put(queue->dev);
+	dev_put_track(queue->dev, &queue->dev_tracker);
 }
 
 static const void *netdev_queue_namespace(struct kobject *kobj)
@@ -1647,7 +1647,7 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index)
 	/* Kobject_put later will trigger netdev_queue_release call
 	 * which decreases dev refcount: Take that reference here
 	 */
-	dev_hold(queue->dev);
+	dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL);
 
 	kobj->kset = dev->queues_kset;
 	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
-- 
2.34.1.400.ga245620fadb-goog