dsa: Use netdev_<level> instead of printk

Neaten and standardize the logging output.

Other miscellanea:

o Use pr_notice_once instead of a guard flag.
o Convert existing pr_<level> uses too.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 0ea466d..528380a 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -532,7 +532,7 @@
 		 */
 		ret = of_phy_register_fixed_link(port_dn);
 		if (ret) {
-			pr_err("failed to register fixed PHY\n");
+			netdev_err(slave_dev, "failed to register fixed PHY\n");
 			return;
 		}
 		phy_is_fixed = true;
@@ -558,8 +558,8 @@
 		phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
 				   p->phy_interface);
 	} else {
-		pr_info("attached PHY at address %d [%s]\n",
-			p->phy->addr, p->phy->drv->name);
+		netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
+			    p->phy->addr, p->phy->drv->name);
 	}
 }
 
@@ -657,8 +657,8 @@
 
 	ret = register_netdev(slave_dev);
 	if (ret) {
-		printk(KERN_ERR "%s: error %d registering interface %s\n",
-				master->name, ret, slave_dev->name);
+		netdev_err(master, "error %d registering interface %s\n",
+			   ret, slave_dev->name);
 		free_netdev(slave_dev);
 		return NULL;
 	}