linux-kernel - [PATCH rdma-next] RDMA/mlx5: Don't add slave port to unaffiliated list

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Date:   Mon, 31 May 2021 19:04:44 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Daniel Jurgens <danielj@...lanox.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Parav Pandit <parav@...lanox.com>
Subject: [PATCH rdma-next] RDMA/mlx5: Don't add slave port to unaffiliated list

From: Leon Romanovsky <leonro@...dia.com>

The mlx5_ib_bind_slave_port() doesn't remove multiport device from the
unaffiliated list, but mlx5_ib_unbind_slave_port() did it. This unbalanced
flow caused to the situation where mlx5_ib_unaffiliated_port_list was changed
during iteration.

Fixes: 32f69e4be269 ("{net, IB}/mlx5: Manage port association for multiport RoCE")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/infiniband/hw/mlx5/main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 9357ed28813c..e541a9f5f163 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -3192,8 +3192,6 @@ static void mlx5_ib_unbind_slave_port(struct mlx5_ib_dev *ibdev,
 
 	port->mp.mpi = NULL;
 
-	list_add_tail(&mpi->list, &mlx5_ib_unaffiliated_port_list);
-
 	spin_unlock(&port->mp.mpi_lock);
 
 	err = mlx5_nic_vport_unaffiliate_multiport(mpi->mdev);
@@ -3342,6 +3340,8 @@ static void mlx5_ib_cleanup_multiport_master(struct mlx5_ib_dev *dev)
 				mlx5_ib_dbg(dev, "unbinding port_num: %u\n",
 					    i + 1);
 				mlx5_ib_unbind_slave_port(dev, dev->port[i].mp.mpi);
+				list_add_tail(&dev->port[i].mp.mpi->list,
+					      &mlx5_ib_unaffiliated_port_list);
 			}
 		}
 	}
-- 
2.31.1