netdev - [PATCH net-next v3 2/3] net: ipvlan: add net device refcount tracker

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Message-ID: <185e45470629ad7a0aeef7a61b608d5cf13fcbf3.1647664114.git.william.xuanziyang@huawei.com>
Date:   Sat, 19 Mar 2022 17:53:13 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>
CC:     <edumazet@...gle.com>, <brianvv@...gle.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next v3 2/3] net: ipvlan: add net device refcount tracker

Add net device refcount tracker to ipvlan.

Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 drivers/net/ipvlan/ipvlan.h      | 1 +
 drivers/net/ipvlan/ipvlan_main.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipvlan/ipvlan.h b/drivers/net/ipvlan/ipvlan.h
index 3837c897832e..6605199305b7 100644
--- a/drivers/net/ipvlan/ipvlan.h
+++ b/drivers/net/ipvlan/ipvlan.h
@@ -64,6 +64,7 @@ struct ipvl_dev {
 	struct list_head	pnode;
 	struct ipvl_port	*port;
 	struct net_device	*phy_dev;
+	netdevice_tracker	dev_tracker;
 	struct list_head	addrs;
 	struct ipvl_pcpu_stats	__percpu *pcpu_stats;
 	DECLARE_BITMAP(mac_filters, IPVLAN_MAC_FILTER_SIZE);
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index dcdc01403f22..be06f122092e 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -160,7 +160,7 @@ static int ipvlan_init(struct net_device *dev)
 	port->count += 1;
 
 	/* Get ipvlan's reference to phy_dev */
-	dev_hold(phy_dev);
+	dev_hold_track(phy_dev, &ipvlan->dev_tracker, GFP_KERNEL);
 
 	return 0;
 }
@@ -674,7 +674,7 @@ static void ipvlan_dev_free(struct net_device *dev)
 	struct ipvl_dev *ipvlan = netdev_priv(dev);
 
 	/* Get rid of the ipvlan's reference to phy_dev */
-	dev_put(ipvlan->phy_dev);
+	dev_put_track(ipvlan->phy_dev, &ipvlan->dev_tracker);
 }
 
 void ipvlan_link_setup(struct net_device *dev)
-- 
2.25.1