netdev - [PATCH net-next] nfp: flower: fix 'variable 'flow6' set but not used'

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Date:   Tue, 10 May 2022 09:48:45 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, oss-drivers@...igine.com,
        Louis Peens <louis.peens@...igine.com>,
        kernel test robot <lkp@...el.com>,
        Simon Horman <simon.horman@...igine.com>
Subject: [PATCH net-next] nfp: flower: fix 'variable 'flow6' set but not used'

From: Louis Peens <louis.peens@...igine.com>

Kernel test robot reported an issue after a recent patch about an
unused variable when CONFIG_IPV6 is disabled. Move the variable
declaration to be inside the #ifdef, and do a bit more cleanup. There
is no need to use a temporary ipv6 bool value, it is just checked once,
remove the extra variable and just do the check directly.

Fixes: 9d5447ed44b5 ("nfp: flower: fixup ipv6/ipv4 route lookup for neigh events")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
Signed-off-by: Simon Horman <simon.horman@...igine.com>
---
 .../netronome/nfp/flower/tunnel_conf.c        | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
index 9c37ed6943d0..6bf3ec448e7e 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
@@ -563,12 +563,9 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
 {
 	struct nfp_flower_priv *app_priv;
 	struct netevent_redirect *redir;
-	struct flowi4 flow4 = {};
-	struct flowi6 flow6 = {};
 	struct neighbour *n;
 	struct nfp_app *app;
 	bool neigh_invalid;
-	bool ipv6 = false;
 	int err;
 
 	switch (event) {
@@ -583,16 +580,8 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
 		return NOTIFY_DONE;
 	}
 
-	if (n->tbl->family == AF_INET6)
-		ipv6 = true;
-
 	neigh_invalid = !(n->nud_state & NUD_VALID) || n->dead;
 
-	if (ipv6)
-		flow6.daddr = *(struct in6_addr *)n->primary_key;
-	else
-		flow4.daddr = *(__be32 *)n->primary_key;
-
 	app_priv = container_of(nb, struct nfp_flower_priv, tun.neigh_nb);
 	app = app_priv->app;
 
@@ -601,8 +590,11 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
 		return NOTIFY_DONE;
 
 #if IS_ENABLED(CONFIG_INET)
-	if (ipv6) {
+	if (n->tbl->family == AF_INET6) {
 #if IS_ENABLED(CONFIG_IPV6)
+		struct flowi6 flow6 = {};
+
+		flow6.daddr = *(struct in6_addr *)n->primary_key;
 		if (!neigh_invalid) {
 			struct dst_entry *dst;
 			/* Use ipv6_dst_lookup_flow to populate flow6->saddr
@@ -623,6 +615,9 @@ nfp_tun_neigh_event_handler(struct notifier_block *nb, unsigned long event,
 		return NOTIFY_DONE;
 #endif /* CONFIG_IPV6 */
 	} else {
+		struct flowi4 flow4 = {};
+
+		flow4.daddr = *(__be32 *)n->primary_key;
 		if (!neigh_invalid) {
 			struct rtable *rt;
 			/* Use ip_route_output_key to populate flow4->saddr and
-- 
2.30.2