[PATCH 4.19 136/421] RDMA/mlx5: Dont add slave port to unaffiliated list

Greg Kroah-Hartman
2021-07-19T16:11:39Z

From: Leon Romanovsky <leonro@nvidia.com>

[ Upstream commit 7ce6095e3bff8e20ce018b050960b527e298f7df ]

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")
Link: https://lore.kernel.org/r/2726e6603b1e6ecfe76aa5a12a063af72173bcf7.1622477058.git.leonro@nvidia.com
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 13513466df01..eaf9de421f8d 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -5374,8 +5374,6 @@ 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);
@@ -5525,6 +5523,8 @@ static void mlx5_ib_cleanup_multiport_master(struct mlx5_ib_dev *dev)
} else {
mlx5_ib_dbg(dev, "unbinding port_num: %d\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);
}
}
}
--
2.30.2