linux-kernel - [PATCH 1/3] netpoll: Extract carrier wait function

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Message-Id: <20250618-netpoll_ip_ref-v1-1-c2ac00fe558f@debian.org>
Date: Wed, 18 Jun 2025 02:32:45 -0700
From: Breno Leitao <leitao@...ian.org>
To: "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>
Cc: jv@...sburgh.ne, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Breno Leitao <leitao@...ian.org>, gustavold@...il.com
Subject: [PATCH 1/3] netpoll: Extract carrier wait function

Extract the carrier waiting logic into a dedicated helper function
netpoll_wait_carrier() to improve code readability and reduce
duplication in netpoll_setup().

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 net/core/netpoll.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 07c453864a7df..473d0006cca1f 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -583,6 +583,21 @@ static char *egress_dev(struct netpoll *np, char *buf)
 	return buf;
 }

+static void netpoll_wait_carrier(struct netpoll *np, struct net_device *ndev,
+				 unsigned int timeout)
+{
+	unsigned long atmost;
+
+	atmost = jiffies + timeout * HZ;
+	while (!netif_carrier_ok(ndev)) {
+		if (time_after(jiffies, atmost)) {
+			np_notice(np, "timeout waiting for carrier\n");
+			break;
+		}
+		msleep(1);
+	}
+}
+
 int netpoll_setup(struct netpoll *np)
 {
 	struct net *net = current->nsproxy->net_ns;
@@ -613,28 +628,17 @@ int netpoll_setup(struct netpoll *np)
 	}

 	if (!netif_running(ndev)) {
-		unsigned long atmost;
-
 		np_info(np, "device %s not up yet, forcing it\n",
 			egress_dev(np, buf));

 		err = dev_open(ndev, NULL);
-
 		if (err) {
 			np_err(np, "failed to open %s\n", ndev->name);
 			goto put;
 		}

 		rtnl_unlock();
-		atmost = jiffies + carrier_timeout * HZ;
-		while (!netif_carrier_ok(ndev)) {
-			if (time_after(jiffies, atmost)) {
-				np_notice(np, "timeout waiting for carrier\n");
-				break;
-			}
-			msleep(1);
-		}
-
+		netpoll_wait_carrier(np, ndev, carrier_timeout);
 		rtnl_lock();
 	}

-- 
2.47.1