netdev - [PATCH net-next] ipvlan: properly annotate rx

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Message-Id: <3eef25d5e0b41aa3429ba31f87264c17e75de9e6.1520500821.git.pabeni@redhat.com>
Date:   Thu,  8 Mar 2018 10:29:30 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Jiri Benc <jbenc@...hat.com>
Subject: [PATCH net-next] ipvlan: properly annotate rx_handler access

The rx_handler field is rcu-protected, but I forgot to use the
proper accessor while refactoring netif_is_ipvlan_port(). Such
function only check the rx_handler value, so it is safe, but we need
to properly read rx_handler via rcu_access_pointer() to avoid sparse
warnings.

Fixes: 1ec54cb44e67 ("net: unpollute priv_flags space")
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 drivers/net/ipvlan/ipvlan.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ipvlan/ipvlan.h b/drivers/net/ipvlan/ipvlan.h
index c818b9bdab6e..adb826f55e60 100644
--- a/drivers/net/ipvlan/ipvlan.h
+++ b/drivers/net/ipvlan/ipvlan.h
@@ -180,7 +180,7 @@ int ipvlan_link_register(struct rtnl_link_ops *ops);
 
 static inline bool netif_is_ipvlan_port(const struct net_device *dev)
 {
-	return dev->rx_handler == ipvlan_handle_frame;
+	return rcu_access_pointer(dev->rx_handler) == ipvlan_handle_frame;
 }
 
 #endif /* __IPVLAN_H */
-- 
2.14.3