linux-kernel - [PATCH] RDMA/i40iw: Fix incorrect iterator type

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Message-Id: <20180917140707.1253738-1-Haakon.Bugge@oracle.com>
Date:   Mon, 17 Sep 2018 16:07:07 +0200
From:   Håkon Bugge <Haakon.Bugge@...cle.com>
To:     Doug Ledford <dledford@...hat.com>, faisal.latif@...el.com,
        shiraz.saleem@...el.com, jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] RDMA/i40iw: Fix incorrect iterator type

Commit f27b4746f378 ("i40iw: add connection management code") uses an
incorrect rcu iterator, whilst holding the rtnl_lock. Since the
critical region invokes i40iw_manage_qhash(), which is a sleeping
function, the rcu locking and traversal cannot be used.

Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>
---
 drivers/infiniband/hw/i40iw/i40iw_cm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.c b/drivers/infiniband/hw/i40iw/i40iw_cm.c
index 423818a7d333..771eb6bd0785 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.c
@@ -1689,7 +1689,7 @@ static enum i40iw_status_code i40iw_add_mqh_6(struct i40iw_device *iwdev,
 	unsigned long flags;
 
 	rtnl_lock();
-	for_each_netdev_rcu(&init_net, ip_dev) {
+	for_each_netdev(&init_net, ip_dev) {
 		if ((((rdma_vlan_dev_vlan_id(ip_dev) < I40IW_NO_VLAN) &&
 		      (rdma_vlan_dev_real_dev(ip_dev) == iwdev->netdev)) ||
 		     (ip_dev == iwdev->netdev)) && (ip_dev->flags & IFF_UP)) {
-- 
2.14.3