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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,
	"Paul E . McKenney" <paulmck@kernel.org>,
	linux-kernel@vger.kernel.org,
	Joel Fernandes <joel@joelfernandes.org>,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: [Linux-kernel-mentees] [PATCH 2/2] drivers: scsi: qedf: qedf_main: Pass lockdep expression to RCU lists
Date: Fri, 17 Jan 2020 21:01:24 +0530	[thread overview]
Message-ID: <20200117153123.2648-2-frextrite@gmail.com> (raw)
In-Reply-To: <20200117153123.2648-1-frextrite@gmail.com>

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

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

WARNING: multiple messages have this Message-ID (diff)
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	[thread overview]
Message-ID: <20200117153123.2648-2-frextrite@gmail.com> (raw)
In-Reply-To: <20200117153123.2648-1-frextrite@gmail.com>

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


  reply	other threads:[~2020-01-17 15:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-17 15:31 [Linux-kernel-mentees] [PATCH 1/2] drivers: scsi: fcoe: fcoe_ctlr: Pass lockdep expression to RCU lists Amol Grover
2020-01-17 15:31 ` Amol Grover
2020-01-17 15:31 ` Amol Grover [this message]
2020-01-17 15:31   ` [PATCH 2/2] drivers: scsi: qedf: qedf_main: " Amol Grover

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