netdev - [PATCH v2 net-next 2/6] net: dsa: merge rtnl_lock sections in dsa_slave

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Date:   Thu,  6 Jan 2022 01:11:13 +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 v2 net-next 2/6] net: dsa: merge rtnl_lock sections in dsa_slave_create

Currently dsa_slave_create() has two sequences of rtnl_lock/rtnl_unlock
in a row. Remove the rtnl_unlock() and rtnl_lock() in between, such that
the operation can execute slighly faster.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/dsa/slave.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 88bcdba92fa7..22241afcac81 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2022,14 +2022,12 @@ int dsa_slave_create(struct dsa_port *port)
 	}
 
 	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);
 	if (ret) {
 		netdev_err(master, "error %d registering interface %s\n",
-- 
2.25.1