netdev - [PATCH net] plip: avoid rcu debug splat

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Message-Id: <20220807115304.13257-1-fw@strlen.de>
Date:   Sun,  7 Aug 2022 13:53:04 +0200
From:   Florian Westphal <fw@...len.de>
To:     netdev@...r.kernel.org
Cc:     edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        davem@...emloft.net, Florian Westphal <fw@...len.de>,
        kernel test robot <oliver.sang@...el.com>
Subject: [PATCH net] plip: avoid rcu debug splat

WARNING: suspicious RCU usage
5.2.0-rc2-00605-g2638eb8b50cfc #1 Not tainted
drivers/net/plip/plip.c:1110 suspicious rcu_dereference_check() usage!

plip_open is called with RTNL held, switch to the correct helper.

Fixes: 2638eb8b50cf ("net: ipv4: provide __rcu annotation for ifa_list")
Reported-by: kernel test robot <oliver.sang@...el.com>
Signed-off-by: Florian Westphal <fw@...len.de>
---
 drivers/net/plip/plip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/plip/plip.c b/drivers/net/plip/plip.c
index dafd3e9ebbf8..c8791e9b451d 100644
--- a/drivers/net/plip/plip.c
+++ b/drivers/net/plip/plip.c
@@ -1111,7 +1111,7 @@ plip_open(struct net_device *dev)
 		/* Any address will do - we take the first. We already
 		   have the first two bytes filled with 0xfc, from
 		   plip_init_dev(). */
-		const struct in_ifaddr *ifa = rcu_dereference(in_dev->ifa_list);
+		const struct in_ifaddr *ifa = rtnl_dereference(in_dev->ifa_list);
 		if (ifa != NULL) {
 			dev_addr_mod(dev, 2, &ifa->ifa_local, 4);
 		}
-- 
2.37.1