bridge: fix netconsole setup over bridge

Commit 93d8bf9fb8 ("bridge: cleanup netpoll code") introduced
a check in br_netpoll_enable(), but this check is incorrect for
br_netpoll_setup(). This patch moves the code after the check
into __br_netpoll_enable() and calls it in br_netpoll_setup().
For br_add_if(), the check is still needed.

Fixes: 93d8bf9fb8 ("bridge: cleanup netpoll code")
Cc: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Tested-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_device.c

@@ -226,37 +226,11 @@ static void br_netpoll_cleanup(struct net_device *dev)
 		br_netpoll_disable(p);
 }
 
-static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
-			    gfp_t gfp)
-{
-	struct net_bridge *br = netdev_priv(dev);
-	struct net_bridge_port *p;
-	int err = 0;
-
-	list_for_each_entry(p, &br->port_list, list) {
-		if (!p->dev)
-			continue;
-		err = br_netpoll_enable(p, gfp);
-		if (err)
-			goto fail;
-	}
-
-out:
-	return err;
-
-fail:
-	br_netpoll_cleanup(dev);
-	goto out;
-}
-
-int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
+static int __br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 {
 	struct netpoll *np;
 	int err;
 
-	if (!p->br->dev->npinfo)
-		return 0;
-
 	np = kzalloc(sizeof(*p->np), gfp);
 	if (!np)
 		return -ENOMEM;
@@ -271,6 +245,37 @@ int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 	return err;
 }
 
+int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
+{
+	if (!p->br->dev->npinfo)
+		return 0;
+
+	return __br_netpoll_enable(p, gfp);
+}
+
+static int br_netpoll_setup(struct net_device *dev, struct netpoll_info *ni,
+			    gfp_t gfp)
+{
+	struct net_bridge *br = netdev_priv(dev);
+	struct net_bridge_port *p;
+	int err = 0;
+
+	list_for_each_entry(p, &br->port_list, list) {
+		if (!p->dev)
+			continue;
+		err = __br_netpoll_enable(p, gfp);
+		if (err)
+			goto fail;
+	}
+
+out:
+	return err;
+
+fail:
+	br_netpoll_cleanup(dev);
+	goto out;
+}
+
 void br_netpoll_disable(struct net_bridge_port *p)
 {
 	struct netpoll *np = p->np;