linux-kernel - [PATCH 7/7] netpoll: Flush skb_pool as part of netconsole cleanup

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Message-Id: <20250902-netpoll_untangle_v3-v1-7-51a03d6411be@debian.org>
Date: Tue, 02 Sep 2025 07:36:29 -0700
From: Breno Leitao <leitao@...ian.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Clark Williams <clrkwllms@...nel.org>, Steven Rostedt <rostedt@...dmis.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-rt-devel@...ts.linux.dev, kernel-team@...a.com, efault@....de, 
 calvin@...nvd.org, Breno Leitao <leitao@...ian.org>
Subject: [PATCH 7/7] netpoll: Flush skb_pool as part of netconsole cleanup

Transfer the skb_pool_flush() function from netpoll to netconsole, and
call it within netpoll_cleanup() to ensure skb pool resources are
properly released once the device is down.

The invocation of skb_pool_flush() was removed from netpoll_setup(), as
the pool is now only managed after successful allocation.

This complete the move of skb pool management from netpoll to
netconsole.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/net/netconsole.c | 10 ++++++++++
 net/core/netpoll.c       | 15 +--------------
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index bf7bab7a9c2f0..b9bfb78560b3c 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -300,12 +300,22 @@ static struct netconsole_target *alloc_and_init(void)
 	return nt;
 }

+static void skb_pool_flush(struct netpoll *np)
+{
+	struct sk_buff_head *skb_pool;
+
+	cancel_work_sync(&np->refill_wq);
+	skb_pool = &np->skb_pool;
+	skb_queue_purge_reason(skb_pool, SKB_CONSUMED);
+}
+
 static void netpoll_cleanup(struct netpoll *np)
 {
 	rtnl_lock();
 	if (!np->dev)
 		goto out;
 	do_netpoll_cleanup(np);
+	skb_pool_flush(np);
 out:
 	rtnl_unlock();
 }
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 5aa83c9c09e05..c0eeeb9ac3daf 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -326,15 +326,6 @@ netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(netpoll_send_skb);

-static void skb_pool_flush(struct netpoll *np)
-{
-	struct sk_buff_head *skb_pool;
-
-	cancel_work_sync(&np->refill_wq);
-	skb_pool = &np->skb_pool;
-	skb_queue_purge_reason(skb_pool, SKB_CONSUMED);
-}
-
 int __netpoll_setup(struct netpoll *np, struct net_device *ndev)
 {
 	struct netpoll_info *npinfo;
@@ -547,7 +538,7 @@ int netpoll_setup(struct netpoll *np)

 	err = __netpoll_setup(np, ndev);
 	if (err)
-		goto flush;
+		goto put;
 	rtnl_unlock();

 	/* Make sure all NAPI polls which started before dev->npinfo
@@ -558,8 +549,6 @@ int netpoll_setup(struct netpoll *np)

 	return 0;

-flush:
-	skb_pool_flush(np);
 put:
 	DEBUG_NET_WARN_ON_ONCE(np->dev);
 	if (ip_overwritten)
@@ -607,8 +596,6 @@ static void __netpoll_cleanup(struct netpoll *np)
 		call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info);
 	} else
 		RCU_INIT_POINTER(np->dev->npinfo, NULL);
-
-	skb_pool_flush(np);
 }

 void __netpoll_free(struct netpoll *np)

-- 
2.47.3