IB/mlx4: Move rtnl locking to the right place

On the one hand, the invocation of netdev_master_upper_dev_get()
within mlx4_ib_scan_netdevs() must be done with rtnl lock held.  On
the other hand, it's wrong to call rtnl_lock() from within this
function since it's also called by our netdev notifier callback.
Therefore move the locking to mlx4_ib_add() so that both cases are
covered.

Signed-off-by: Moni Shoua <monis@mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index b99d0ec..93f492f 100644 (file)
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -1707,10 +1707,8 @@ static void mlx4_ib_scan_netdevs(struct mlx4_ib_dev *ibdev)
                                                iboe->netdevs[port - 1], port);
                if (iboe->netdevs[port - 1] &&
                    netif_is_bond_slave(iboe->netdevs[port - 1])) {
-                       rtnl_lock();
                        iboe->masters[port - 1] = netdev_master_upper_dev_get(
                                iboe->netdevs[port - 1]);
-                       rtnl_unlock();
                }
                curr_master = iboe->masters[port - 1];
 
@@ -2100,7 +2098,9 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
                        }
                }
 #endif
+               rtnl_lock();
                mlx4_ib_scan_netdevs(ibdev);
+               rtnl_unlock();
                mlx4_ib_init_gid_table(ibdev);
        }