netdev - [PATCH net-next 01/15] net: dsa: reorder PHY initialization with MTU setup in slave.c

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Date:   Tue,  4 Jan 2022 19:13:59 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next 01/15] net: dsa: reorder PHY initialization with MTU setup in slave.c

In dsa_slave_create() there are 2 sections that take rtnl_lock():
MTU change and netdev registration. They are separated by PHY
initialization.

There isn't any strict ordering requirement except for the fact that
netdev registration should be last. Therefore, we can perform the MTU
change a bit later, after the PHY setup. A future change will then be
able to merge the two rtnl_lock sections into one.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/slave.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 88f7b8686dac..88bcdba92fa7 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2011,13 +2011,6 @@ int dsa_slave_create(struct dsa_port *port)
 	port->slave = slave_dev;
 	dsa_slave_setup_tagger(slave_dev);
 
-	rtnl_lock();
-	ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
-	rtnl_unlock();
-	if (ret && ret != -EOPNOTSUPP)
-		dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
-			 ret, ETH_DATA_LEN, port->index);
-
 	netif_carrier_off(slave_dev);
 
 	ret = dsa_slave_phy_setup(slave_dev);
@@ -2028,6 +2021,13 @@ int dsa_slave_create(struct dsa_port *port)
 		goto out_gcells;
 	}
 
+	rtnl_lock();
+	ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
+	rtnl_unlock();
+	if (ret && ret != -EOPNOTSUPP)
+		dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
+			 ret, ETH_DATA_LEN, port->index);
+
 	rtnl_lock();
 
 	ret = register_netdevice(slave_dev);
-- 
2.25.1