IB/mlx4: Verify net device validity on port change event

Processing an event is done in a different context from the one when
the event was dispatched. This requires a check that the slave
net device is still valid when the event is being processed. The check is done
under the iboe lock which ensure correctness.

Fixes: a57500903093 ('IB/mlx4: Add port aggregation support')
Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index ac6e2b710ea6fef928271869f0e170f2bbdb158d..b972c0b41799b51e2f554c1abc703d78e0c4636e 100644 (file)
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -2697,8 +2697,12 @@ static void handle_bonded_port_state_event(struct work_struct *work)
        spin_lock_bh(&ibdev->iboe.lock);
        for (i = 0; i < MLX4_MAX_PORTS; ++i) {
                struct net_device *curr_netdev = ibdev->iboe.netdevs[i];
+               enum ib_port_state curr_port_state;
 
-               enum ib_port_state curr_port_state =
+               if (!curr_netdev)
+                       continue;
+
+               curr_port_state =
                        (netif_running(curr_netdev) &&
                         netif_carrier_ok(curr_netdev)) ?
                        IB_PORT_ACTIVE : IB_PORT_DOWN;