netdev - [PATCH net-next 03/13] net: bridge: add net device refcount tracker

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Message-Id: <20211207013039.1868645-4-eric.dumazet@gmail.com>
Date:   Mon,  6 Dec 2021 17:30:29 -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 03/13] net: bridge: add net device refcount tracker

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

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/bridge/br_if.c      | 6 +++---
 net/bridge/br_private.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 3915832a03c25e22ae2215ee93dceb0f8e5b5cc4..a52ad81596b72dde8e9a0affccd38c91ab59315d 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -274,7 +274,7 @@ static void destroy_nbp(struct net_bridge_port *p)
 
 	p->br = NULL;
 	p->dev = NULL;
-	dev_put(dev);
+	dev_put_track(dev, &p->dev_tracker);
 
 	kobject_put(&p->kobj);
 }
@@ -423,7 +423,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
 		return ERR_PTR(-ENOMEM);
 
 	p->br = br;
-	dev_hold(dev);
+	dev_hold_track(dev, &p->dev_tracker, GFP_KERNEL);
 	p->dev = dev;
 	p->path_cost = port_cost(dev);
 	p->priority = 0x8000 >> BR_PORT_BITS;
@@ -434,7 +434,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
 	br_stp_port_timer_init(p);
 	err = br_multicast_add_port(p);
 	if (err) {
-		dev_put(dev);
+		dev_put_track(dev, &p->dev_tracker);
 		kfree(p);
 		p = ERR_PTR(err);
 	}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index c0efd697865abea651263fc5258715e50c151726..af2b3512d86c8bc0fe799d9d698fa9b6bf3cb94b 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -344,6 +344,7 @@ struct net_bridge_mdb_entry {
 struct net_bridge_port {
 	struct net_bridge		*br;
 	struct net_device		*dev;
+	netdevice_tracker		dev_tracker;
 	struct list_head		list;
 
 	unsigned long			flags;
-- 
2.34.1.400.ga245620fadb-goog