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

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Date:   Thu,  2 Dec 2021 18:46:40 -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 23/23] netpoll: add net device refcount tracker to struct netpoll

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

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/netconsole.c | 2 +-
 include/linux/netpoll.h  | 1 +
 net/core/netpoll.c       | 4 ++--
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index ccecba908ded61370f8fc408ea53aa1ff305aca3..ab8cd555102083c2f0179898681489b987afe5b0 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -721,7 +721,7 @@ static int netconsole_netdev_event(struct notifier_block *this,
 				__netpoll_cleanup(&nt->np);
 
 				spin_lock_irqsave(&target_list_lock, flags);
-				dev_put(nt->np.dev);
+				dev_put_track(nt->np.dev, &nt->np.dev_tracker);
 				nt->np.dev = NULL;
 				nt->enabled = false;
 				stopped = true;
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index e6a2d72e0dc7a6929d32a2e994f24719e073121e..bd19c4b91e31204e85d30884720b761116d5c036 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -24,6 +24,7 @@ union inet_addr {
 
 struct netpoll {
 	struct net_device *dev;
+	netdevice_tracker dev_tracker;
 	char dev_name[IFNAMSIZ];
 	const char *name;
 
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index edfc0f8011f88a7d46d69e94c6343489369fa78c..db724463e7cd5089d85d8f75a77ad83bbece82dc 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -776,7 +776,7 @@ int netpoll_setup(struct netpoll *np)
 	err = __netpoll_setup(np, ndev);
 	if (err)
 		goto put;
-
+	netdev_tracker_alloc(ndev, &np->dev_tracker, GFP_KERNEL);
 	rtnl_unlock();
 	return 0;
 
@@ -853,7 +853,7 @@ void netpoll_cleanup(struct netpoll *np)
 	if (!np->dev)
 		goto out;
 	__netpoll_cleanup(np);
-	dev_put(np->dev);
+	dev_put_track(np->dev, &np->dev_tracker);
 	np->dev = NULL;
 out:
 	rtnl_unlock();
-- 
2.34.1.400.ga245620fadb-goog