netdev - [PATCH RFC net-next 03/13] net: bridge: minor refactor of br

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Date:   Mon, 11 Apr 2022 15:38:27 +0200
From:   Joachim Wiberg <troglobit@...il.com>
To:     Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>
Cc:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Joachim Wiberg <troglobit@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH RFC net-next 03/13] net: bridge: minor refactor of br_setlink() for readability

The br_setlink() function extracts the struct net_bridge pointer a bit
sloppy.  It's easy to interpret the code wrong.  This patch attempts to
clear things up a bit.

Signed-off-by: Joachim Wiberg <troglobit@...il.com>
---
 net/bridge/br_netlink.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 7fca8ff13ec7..8f4297287b32 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1040,6 +1040,8 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags,
 		return 0;
 
 	p = br_port_get_rtnl(dev);
+	if (p)
+		br = p->br;
 	/* We want to accept dev as bridge itself if the AF_SPEC
 	 * is set to see if someone is setting vlan info on the bridge
 	 */
@@ -1055,17 +1057,17 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags,
 			if (err)
 				return err;
 
-			spin_lock_bh(&p->br->lock);
+			spin_lock_bh(&br->lock);
 			err = br_setport(p, tb, extack);
-			spin_unlock_bh(&p->br->lock);
+			spin_unlock_bh(&br->lock);
 		} else {
 			/* Binary compatibility with old RSTP */
 			if (nla_len(protinfo) < sizeof(u8))
 				return -EINVAL;
 
-			spin_lock_bh(&p->br->lock);
+			spin_lock_bh(&br->lock);
 			err = br_set_port_state(p, nla_get_u8(protinfo));
-			spin_unlock_bh(&p->br->lock);
+			spin_unlock_bh(&br->lock);
 		}
 		if (err)
 			goto out;
-- 
2.25.1