netdev - [PATCH net-next 02/13] vlan: add net device refcount tracker

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Date:   Mon,  6 Dec 2021 17:30:28 -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 02/13] vlan: add net device refcount tracker

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

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/if_vlan.h | 3 +++
 net/8021q/vlan_dev.c    | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 41a518336673b496faf7ce0ea2a65068fe6814f2..8420fe5049272bbfa108df794bb351f7d87f7a5c 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -162,6 +162,7 @@ struct netpoll;
  *	@vlan_id: VLAN identifier
  *	@flags: device flags
  *	@real_dev: underlying netdevice
+ *	@dev_tracker: refcount tracker for @real_dev reference
  *	@real_dev_addr: address of underlying netdevice
  *	@dent: proc dir entry
  *	@vlan_pcpu_stats: ptr to percpu rx stats
@@ -177,6 +178,8 @@ struct vlan_dev_priv {
 	u16					flags;
 
 	struct net_device			*real_dev;
+	netdevice_tracker			dev_tracker;
+
 	unsigned char				real_dev_addr[ETH_ALEN];
 
 	struct proc_dir_entry			*dent;
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 866556e041b729af5ebd5184fa3a90374fc3c244..26d031a43cc1a70aa94a5f3efe895efacb612cad 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -616,7 +616,7 @@ static int vlan_dev_init(struct net_device *dev)
 		return -ENOMEM;
 
 	/* Get vlan's reference to real_dev */
-	dev_hold(real_dev);
+	dev_hold_track(real_dev, &vlan->dev_tracker, GFP_KERNEL);
 
 	return 0;
 }
@@ -848,7 +848,7 @@ static void vlan_dev_free(struct net_device *dev)
 	vlan->vlan_pcpu_stats = NULL;
 
 	/* Get rid of the vlan's reference to real_dev */
-	dev_put(vlan->real_dev);
+	dev_put_track(vlan->real_dev, &vlan->dev_tracker);
 }
 
 void vlan_setup(struct net_device *dev)
-- 
2.34.1.400.ga245620fadb-goog