netconsole: take over netpoll_setup() from netpoll

netpoll_setup() is only used by netconsole. All the other users use
__netpoll_setup().

Move netpoll_setup() to netconsole, and rename it to
netcons_netpoll_setup().

Pure code motion: the body is unchanged.

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Gustavo Luiz Duarte <gustavold@gmail.com>
Link: https://patch.msgid.link/20260724-netconsole_move_more_final-v1-3-a5f7691db81c@debian.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

3 files changed, 83 insertions, 85 deletions

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 7f8851a734fc..3a7a2cafc627 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -351,6 +351,86 @@ static void netconsole_skb_pool_flush(struct netconsole_target *nt)
 	skb_queue_purge_reason(&nt->skb_pool, SKB_CONSUMED);
 }
 
+static int netcons_netpoll_setup(struct netpoll *np)
+{
+	struct net *net = current->nsproxy->net_ns;
+	char buf[MAC_ADDR_STR_LEN + 1];
+	struct net_device *ndev = NULL;
+	bool ip_overwritten = false;
+	int err;
+
+	rtnl_lock();
+	if (np->dev_name[0])
+		ndev = __dev_get_by_name(net, np->dev_name);
+	else if (is_valid_ether_addr(np->dev_mac))
+		ndev = dev_getbyhwaddr(net, ARPHRD_ETHER, np->dev_mac);
+
+	if (!ndev) {
+		np_err(np, "%s doesn't exist, aborting\n",
+		       egress_dev(np, buf, sizeof(buf)));
+		err = -ENODEV;
+		goto unlock;
+	}
+	netdev_hold(ndev, &np->dev_tracker, GFP_KERNEL);
+
+	if (netdev_master_upper_dev_get(ndev)) {
+		np_err(np, "%s is a slave device, aborting\n",
+		       egress_dev(np, buf, sizeof(buf)));
+		err = -EBUSY;
+		goto put;
+	}
+
+	if (!netif_running(ndev)) {
+		np_info(np, "device %s not up yet, forcing it\n",
+			egress_dev(np, buf, sizeof(buf)));
+
+		err = dev_open(ndev, NULL);
+		if (err) {
+			np_err(np, "failed to open %s\n", ndev->name);
+			goto put;
+		}
+
+		rtnl_unlock();
+		netpoll_wait_carrier(np, ndev);
+		rtnl_lock();
+	}
+
+	if (netpoll_local_ip_unset(np)) {
+		if (!np->ipv6) {
+			err = netpoll_take_ipv4(np, ndev);
+			if (err)
+				goto put;
+		} else {
+			err = netpoll_take_ipv6(np, ndev);
+			if (err)
+				goto put;
+		}
+		ip_overwritten = true;
+	}
+
+	err = __netpoll_setup(np, ndev);
+	if (err)
+		goto put;
+	rtnl_unlock();
+
+	/* Make sure all NAPI polls which started before dev->npinfo
+	 * was visible have exited before we start calling NAPI poll.
+	 * NAPI skips locking if dev->npinfo is NULL.
+	 */
+	synchronize_rcu();
+
+	return 0;
+
+put:
+	DEBUG_NET_WARN_ON_ONCE(np->dev);
+	if (ip_overwritten)
+		memset(&np->local_ip, 0, sizeof(np->local_ip));
+	netdev_put(ndev, &np->dev_tracker);
+unlock:
+	rtnl_unlock();
+	return err;
+}
+
 /* Attempts to resume logging to a deactivated target. */
 static void resume_target(struct netconsole_target *nt)
 {
@@ -361,7 +441,7 @@ static void resume_target(struct netconsole_target *nt)
 	 */
 	netconsole_skb_pool_init(nt);
 
-	if (netpoll_setup(&nt->np)) {
+	if (netcons_netpoll_setup(&nt->np)) {
 		/* netpoll fails setup once, do not try again. */
 		netconsole_skb_pool_flush(nt);
 		nt->state = STATE_DISABLED;
@@ -840,7 +920,7 @@ static ssize_t enabled_store(struct config_item *item,
 		 */
 		netconsole_skb_pool_init(nt);
 
-		ret = netpoll_setup(&nt->np);
+		ret = netcons_netpoll_setup(&nt->np);
 		if (ret) {
 			netconsole_skb_pool_flush(nt);
 			goto out_unlock;
@@ -2430,7 +2510,7 @@ static struct netconsole_target *alloc_param_target(char *target_config,
 	 */
 	netconsole_skb_pool_init(nt);
 
-	err = netpoll_setup(&nt->np);
+	err = netcons_netpoll_setup(&nt->np);
 	if (err) {
 		pr_err("Not enabling netconsole for %s%d. Netpoll setup failed\n",
 		       NETCONSOLE_PARAM_TARGET_PREFIX, cmdline_count);
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index 0877515fa744..cd455a5a013d 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -66,7 +66,6 @@ static inline void netpoll_poll_enable(struct net_device *dev) { return; }
 #endif
 
 int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
-int netpoll_setup(struct netpoll *np);
 void __netpoll_free(struct netpoll *np);
 void netpoll_cleanup(struct netpoll *np);
 void do_netpoll_cleanup(struct netpoll *np);
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 6a545063223b..d50d48a82def 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -514,87 +514,6 @@ bool netpoll_local_ip_unset(const struct netpoll *np)
 }
 EXPORT_SYMBOL_GPL(netpoll_local_ip_unset);
 
-int netpoll_setup(struct netpoll *np)
-{
-	struct net *net = current->nsproxy->net_ns;
-	char buf[MAC_ADDR_STR_LEN + 1];
-	struct net_device *ndev = NULL;
-	bool ip_overwritten = false;
-	int err;
-
-	rtnl_lock();
-	if (np->dev_name[0])
-		ndev = __dev_get_by_name(net, np->dev_name);
-	else if (is_valid_ether_addr(np->dev_mac))
-		ndev = dev_getbyhwaddr(net, ARPHRD_ETHER, np->dev_mac);
-
-	if (!ndev) {
-		np_err(np, "%s doesn't exist, aborting\n",
-		       egress_dev(np, buf, sizeof(buf)));
-		err = -ENODEV;
-		goto unlock;
-	}
-	netdev_hold(ndev, &np->dev_tracker, GFP_KERNEL);
-
-	if (netdev_master_upper_dev_get(ndev)) {
-		np_err(np, "%s is a slave device, aborting\n",
-		       egress_dev(np, buf, sizeof(buf)));
-		err = -EBUSY;
-		goto put;
-	}
-
-	if (!netif_running(ndev)) {
-		np_info(np, "device %s not up yet, forcing it\n",
-			egress_dev(np, buf, sizeof(buf)));
-
-		err = dev_open(ndev, NULL);
-		if (err) {
-			np_err(np, "failed to open %s\n", ndev->name);
-			goto put;
-		}
-
-		rtnl_unlock();
-		netpoll_wait_carrier(np, ndev);
-		rtnl_lock();
-	}
-
-	if (netpoll_local_ip_unset(np)) {
-		if (!np->ipv6) {
-			err = netpoll_take_ipv4(np, ndev);
-			if (err)
-				goto put;
-		} else {
-			err = netpoll_take_ipv6(np, ndev);
-			if (err)
-				goto put;
-		}
-		ip_overwritten = true;
-	}
-
-	err = __netpoll_setup(np, ndev);
-	if (err)
-		goto put;
-	rtnl_unlock();
-
-	/* Make sure all NAPI polls which started before dev->npinfo
-	 * was visible have exited before we start calling NAPI poll.
-	 * NAPI skips locking if dev->npinfo is NULL.
-	 */
-	synchronize_rcu();
-
-	return 0;
-
-put:
-	DEBUG_NET_WARN_ON_ONCE(np->dev);
-	if (ip_overwritten)
-		memset(&np->local_ip, 0, sizeof(np->local_ip));
-	netdev_put(ndev, &np->dev_tracker);
-unlock:
-	rtnl_unlock();
-	return err;
-}
-EXPORT_SYMBOL(netpoll_setup);
-
 static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head)
 {
 	struct netpoll_info *npinfo =