[PATCH net] net/mlx4_core: Check device state before unregistering it

[Tariq Toukan]

From: Alex Vesker <va...@mellanox.com>

Verify that the device state is registered before un-registering it.
This check is required to prevent an OOPS on flows that do
re-registration of the device and its previous state was
unregistered.

Fixes: 225c7b1feef1 ("IB/mlx4: Add a driver Mellanox ConnectX InfiniBand 
adapters")
Signed-off-by: Alex Vesker <va...@mellanox.com>
Signed-off-by: Tariq Toukan <tar...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/intf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/intf.c 
b/drivers/net/ethernet/mellanox/mlx4/intf.c
index dec77d6f0ac9..5aeb6027b70e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/intf.c
+++ b/drivers/net/ethernet/mellanox/mlx4/intf.c
@@ -218,6 +218,9 @@ void mlx4_unregister_device(struct mlx4_dev *dev)
        struct mlx4_priv *priv = mlx4_priv(dev);
        struct mlx4_interface *intf;
 
+       if (!(dev->persist->interface_state & MLX4_INTERFACE_STATE_UP))
+               return;
+
        mlx4_stop_catas_poll(dev);
        mutex_lock(&intf_mutex);
 
-- 
1.8.3.1