From: Amol Grover <frextrite@gmail•com>
To: "David S . Miller" <davem@davemloft•net>,
Jakub Kicinski <kuba@kernel•org>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
Thomas Gleixner <tglx@linutronix•de>,
Richard Fontana <rfontana@redhat•com>,
Allison Randal <allison@lohutok•net>,
Paolo Abeni <pabeni@redhat•com>
Cc: netdev@vger•kernel.org, linux-kernel@vger•kernel.org,
linux-kernel-mentees@lists•linuxfoundation.org,
Joel Fernandes <joel@joelfernandes•org>,
Madhuparna Bhowmik <madhuparnabhowmik10@gmail•com>,
"Paul E . Mckenney" <paulmck@kernel•org>,
Amol Grover <frextrite@gmail•com>,
kernel test robot <lkp@intel•com>
Subject: [PATCH] net: caif: Add lockdep expression to RCU traversal primitive
Date: Thu, 12 Mar 2020 11:04:20 +0530 [thread overview]
Message-ID: <20200312053419.12258-1-frextrite@gmail.com> (raw)
caifdevs->list is traversed using list_for_each_entry_rcu()
outside an RCU read-side critical section but under the
protection of rtnl_mutex. Hence, add the corresponding lockdep
expression to silence the following false-positive warning:
[ 10.868467] =============================
[ 10.869082] WARNING: suspicious RCU usage
[ 10.869817] 5.6.0-rc1-00177-g06ec0a154aae4 #1 Not tainted
[ 10.870804] -----------------------------
[ 10.871557] net/caif/caif_dev.c:115 RCU-list traversed in non-reader section!!
Reported-by: kernel test robot <lkp@intel•com>
Signed-off-by: Amol Grover <frextrite@gmail•com>
---
net/caif/caif_dev.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c
index 03c7cdd8e4cb..195d2d67be8a 100644
--- a/net/caif/caif_dev.c
+++ b/net/caif/caif_dev.c
@@ -112,7 +112,8 @@ static struct caif_device_entry *caif_get(struct net_device *dev)
caif_device_list(dev_net(dev));
struct caif_device_entry *caifd;
- list_for_each_entry_rcu(caifd, &caifdevs->list, list) {
+ list_for_each_entry_rcu(caifd, &caifdevs->list, list,
+ lockdep_rtnl_is_held()) {
if (caifd->netdev == dev)
return caifd;
}
--
2.25.1
next reply other threads:[~2020-03-12 5:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 5:34 Amol Grover [this message]
2020-03-12 5:55 ` [PATCH] net: caif: Add lockdep expression to RCU traversal primitive David Miller
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