netdev - [PATCH v3 net-next 10/23] ipv6: add net device refcount tracker to rt6_probe

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Message-Id: <20211205042217.982127-11-eric.dumazet@gmail.com>
Date:   Sat,  4 Dec 2021 20:22:04 -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>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH v3 net-next 10/23] ipv6: add net device refcount tracker to rt6_probe_deferred()

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

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv6/route.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ba4dc94d76d63c98ff49c41b712231f81eb8af40..8d834f901b483edf75c493620d38f979a4bcbf69 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -593,6 +593,7 @@ struct __rt6_probe_work {
 	struct work_struct work;
 	struct in6_addr target;
 	struct net_device *dev;
+	netdevice_tracker dev_tracker;
 };
 
 static void rt6_probe_deferred(struct work_struct *w)
@@ -603,7 +604,7 @@ static void rt6_probe_deferred(struct work_struct *w)
 
 	addrconf_addr_solict_mult(&work->target, &mcaddr);
 	ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
-	dev_put(work->dev);
+	dev_put_track(work->dev, &work->dev_tracker);
 	kfree(work);
 }
 
@@ -657,7 +658,7 @@ static void rt6_probe(struct fib6_nh *fib6_nh)
 	} else {
 		INIT_WORK(&work->work, rt6_probe_deferred);
 		work->target = *nh_gw;
-		dev_hold(dev);
+		dev_hold_track(dev, &work->dev_tracker, GFP_KERNEL);
 		work->dev = dev;
 		schedule_work(&work->work);
 	}
-- 
2.34.1.400.ga245620fadb-goog