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From:   Amol Grover <frextrite@gmail.com>
To:     Hannes Reinecke <hare@suse.de>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Cc:     linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        Joel Fernandes <joel@joelfernandes.org>,
        Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Amol Grover <frextrite@gmail.com>
Subject: [PATCH 2/2] drivers: scsi: qedf: qedf_main: Pass lockdep expression to RCU lists
Date:   Fri, 17 Jan 2020 21:01:24 +0530
Message-Id: <20200117153123.2648-2-frextrite@gmail.com>
In-Reply-To: <20200117153123.2648-1-frextrite@gmail.com>
References: <20200117153123.2648-1-frextrite@gmail.com>
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lport->disc.rports is traversed using list_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of lport->disc.disc_mutex.

Hence, add corresponding lockdep expression to silence false-positive
lockdep warnings, and harden RCU lists.

Signed-off-by: Amol Grover <frextrite@gmail.com>
---
 drivers/scsi/qedf/qedf_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 604856e72cfb..17eab7f8cf05 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -420,7 +420,8 @@ static void qedf_link_recovery(struct work_struct *work)
 	 * ADISC since the rport is in state ready.
 	 */
 	mutex_lock(&lport->disc.disc_mutex);
-	list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
+	list_for_each_entry_rcu(rdata, &lport->disc.rports, peers,
+				lockdep_is_held(&lport->disc.disc_mutex)) {
 		if (kref_get_unless_zero(&rdata->kref)) {
 			fc_rport_login(rdata);
 			kref_put(&rdata->kref, fc_rport_destroy);
-- 
2.24.1