netdev - [PATCH net-next 5/8] net: bridge: reduce indentation level in fdb

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Date:   Tue, 26 Oct 2021 17:27:40 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Jiri Pirko <jiri@...dia.com>
Subject: [PATCH net-next 5/8] net: bridge: reduce indentation level in fdb_create

We can express the same logic without an "if" condition as big as the
function, just return early if the kmem_cache_alloc() call fails.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 net/bridge/br_fdb.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 09e7a1dd9e3c..f2b909aedabf 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -382,23 +382,26 @@ static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
 					       unsigned long flags)
 {
 	struct net_bridge_fdb_entry *fdb;
+	int err;
 
 	fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
-	if (fdb) {
-		memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
-		WRITE_ONCE(fdb->dst, source);
-		fdb->key.vlan_id = vid;
-		fdb->flags = flags;
-		fdb->updated = fdb->used = jiffies;
-		if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
-						  &fdb->rhnode,
-						  br_fdb_rht_params)) {
-			kmem_cache_free(br_fdb_cache, fdb);
-			fdb = NULL;
-		} else {
-			hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
-		}
+	if (!fdb)
+		return NULL;
+
+	memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
+	WRITE_ONCE(fdb->dst, source);
+	fdb->key.vlan_id = vid;
+	fdb->flags = flags;
+	fdb->updated = fdb->used = jiffies;
+	err = rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, &fdb->rhnode,
+					    br_fdb_rht_params);
+	if (err) {
+		kmem_cache_free(br_fdb_cache, fdb);
+		return NULL;
 	}
+
+	hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
+
 	return fdb;
 }
 
-- 
2.25.1