[PATCH net] net/mlx5: Not returning mlx5_link_info table when speed is unknown

[Li Tian]

Because mlx5e_link_mode is sparse e.g. Azure mlx5 reports PTYS 19.
Do not return it when speed unless retrieved successfully.

Fixes: 65a5d35571849 ("net/mlx5: Refactor link speed handling with 
mlx5_link_info struct")
Suggested-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
Signed-off-by: Li Tian <lit...@redhat.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/port.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c 
b/drivers/net/ethernet/mellanox/mlx5/core/port.c
index 2d7adf7444ba..a69c83da2542 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
@@ -1170,7 +1170,11 @@ const struct mlx5_link_info *mlx5_port_ptys2info(struct 
mlx5_core_dev *mdev,
        mlx5e_port_get_link_mode_info_arr(mdev, &table, &max_size,
                                          force_legacy);
        i = find_first_bit(&temp, max_size);
-       if (i < max_size)
+       /*
+        * mlx5e_link_mode is sparse. Check speed
+        * is non-zero as indication of a hole.
+        */
+       if (i < max_size && table[i].speed)
                return &table[i];
 
        return NULL;
-- 
2.50.0