netdev - [PATCH net-next 07/17] ppp: add netns refcount tracker

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Message-Id: <20211207005142.1688204-8-eric.dumazet@gmail.com>
Date:   Mon,  6 Dec 2021 16:51:32 -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 07/17] ppp: add netns refcount tracker

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

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

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 1180a0e2445fbfb3204fea785f1c1cf48bc77141..9e52c5d2d77fce39b230605ec96fed9798858a13 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -173,6 +173,7 @@ struct channel {
 	spinlock_t	downl;		/* protects `chan', file.xq dequeue */
 	struct ppp	*ppp;		/* ppp unit we're connected to */
 	struct net	*chan_net;	/* the net channel belongs to */
+	netns_tracker	ns_tracker;
 	struct list_head clist;		/* link in list of channels per unit */
 	rwlock_t	upl;		/* protects `ppp' and 'bridge' */
 	struct channel __rcu *bridge;	/* "bridged" ppp channel */
@@ -2879,7 +2880,7 @@ int ppp_register_net_channel(struct net *net, struct ppp_channel *chan)
 
 	pch->ppp = NULL;
 	pch->chan = chan;
-	pch->chan_net = get_net(net);
+	pch->chan_net = get_net_track(net, &pch->ns_tracker, GFP_KERNEL);
 	chan->ppp = pch;
 	init_ppp_file(&pch->file, CHANNEL);
 	pch->file.hdrlen = chan->hdrlen;
@@ -3519,7 +3520,7 @@ ppp_disconnect_channel(struct channel *pch)
  */
 static void ppp_destroy_channel(struct channel *pch)
 {
-	put_net(pch->chan_net);
+	put_net_track(pch->chan_net, &pch->ns_tracker);
 	pch->chan_net = NULL;
 
 	atomic_dec(&channel_count);
-- 
2.34.1.400.ga245620fadb-goog