netdev - [PATCH net-next 04/13] net: watchdog: add net device refcount tracker

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Message-Id: <20211207013039.1868645-5-eric.dumazet@gmail.com>
Date:   Mon,  6 Dec 2021 17:30:30 -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>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 04/13] net: watchdog: add net device refcount tracker

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

Add a netdevice_tracker inside struct net_device, to track
the self reference when a device has an active watchdog timer.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/netdevice.h |  2 ++
 net/sched/sch_generic.c   | 10 ++++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 201d8c5be80685f89d7fdba4b61f83194beb9b13..235d5d082f1a446c8d898ffcc5b1983df7c04f35 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1944,6 +1944,7 @@ enum netdev_ml_priv_type {
  *
  *	@dev_addr_shadow:	Copy of @dev_addr to catch direct writes.
  *	@linkwatch_dev_tracker:	refcount tracker used by linkwatch.
+ *	@watchdog_dev_tracker:	refcount tracker used by watchdog.
  *
  *	FIXME: cleanup struct net_device such that network protocol info
  *	moves out.
@@ -2275,6 +2276,7 @@ struct net_device {
 
 	u8 dev_addr_shadow[MAX_ADDR_LEN];
 	netdevice_tracker	linkwatch_dev_tracker;
+	netdevice_tracker	watchdog_dev_tracker;
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)
 
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 8c8fbf2e385679e46a1b7af47eeac059fb8468cc..b07bd1c7330f54a00c44ecd2e354af76f62b64e8 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -499,6 +499,7 @@ EXPORT_SYMBOL(netif_tx_unlock);
 static void dev_watchdog(struct timer_list *t)
 {
 	struct net_device *dev = from_timer(dev, t, watchdog_timer);
+	bool release = true;
 
 	spin_lock(&dev->tx_global_lock);
 	if (!qdisc_tx_is_noop(dev)) {
@@ -534,12 +535,13 @@ static void dev_watchdog(struct timer_list *t)
 			if (!mod_timer(&dev->watchdog_timer,
 				       round_jiffies(jiffies +
 						     dev->watchdog_timeo)))
-				dev_hold(dev);
+				release = false;
 		}
 	}
 	spin_unlock(&dev->tx_global_lock);
 
-	dev_put(dev);
+	if (release)
+		dev_put_track(dev, &dev->watchdog_dev_tracker);
 }
 
 void __netdev_watchdog_up(struct net_device *dev)
@@ -549,7 +551,7 @@ void __netdev_watchdog_up(struct net_device *dev)
 			dev->watchdog_timeo = 5*HZ;
 		if (!mod_timer(&dev->watchdog_timer,
 			       round_jiffies(jiffies + dev->watchdog_timeo)))
-			dev_hold(dev);
+			dev_hold_track(dev, &dev->watchdog_dev_tracker, GFP_ATOMIC);
 	}
 }
 EXPORT_SYMBOL_GPL(__netdev_watchdog_up);
@@ -563,7 +565,7 @@ static void dev_watchdog_down(struct net_device *dev)
 {
 	netif_tx_lock_bh(dev);
 	if (del_timer(&dev->watchdog_timer))
-		dev_put(dev);
+		dev_put_track(dev, &dev->watchdog_dev_tracker);
 	netif_tx_unlock_bh(dev);
 }
 
-- 
2.34.1.400.ga245620fadb-goog