[PATCH net 02/10] net/mlx4_core: Avoid setting ports to auto when only one port type is supported

[Tariq Toukan]

From: Maor Gottlieb <ma...@mellanox.com>

When only one port type is supported, it should be read only.
We reject changing requests, even to the auto sense mode.

Fixes: 27bf91d6a0d5 ("mlx4_core: Add link type autosensing")
Signed-off-by: Maor Gottlieb <ma...@mellanox.com>
Signed-off-by: Moshe Shemesh <mo...@mellanox.com>
Signed-off-by: Tariq Toukan <tar...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c 
b/drivers/net/ethernet/mellanox/mlx4/main.c
index 7183ac4135d2..6f4e67bc3538 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -1102,6 +1102,14 @@ static int __set_port_type(struct mlx4_port_info *info,
        int i;
        int err = 0;
 
+       if ((port_type & mdev->caps.supported_type[info->port]) != port_type) {
+               mlx4_err(mdev,
+                        "Requested port type for port %d is not supported on 
this HCA\n",
+                        info->port);
+               err = -EINVAL;
+               goto err_sup;
+       }
+
        mlx4_stop_sense(mdev);
        mutex_lock(&priv->port_mutex);
        info->tmp_type = port_type;
@@ -1147,7 +1155,7 @@ static int __set_port_type(struct mlx4_port_info *info,
 out:
        mlx4_start_sense(mdev);
        mutex_unlock(&priv->port_mutex);
-
+err_sup:
        return err;
 }
 
-- 
1.8.3.1