net/mlx5: Check return status first when querying system_image_guid

When querying system_image_guid from firmware, we should check return
value first. The buffer content is valid only if query succeed.

Signed-off-by: Rongwei Liu <rongweil@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
index 4c1440a95ad75784c42d79f995a090aabc729811..8846d30a380a005c257fdbe648186a7a811adbf8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
@@ -421,19 +421,21 @@ int mlx5_query_nic_vport_system_image_guid(struct mlx5_core_dev *mdev,
 {
        u32 *out;
        int outlen = MLX5_ST_SZ_BYTES(query_nic_vport_context_out);
+       int err;
 
        out = kvzalloc(outlen, GFP_KERNEL);
        if (!out)
                return -ENOMEM;
 
-       mlx5_query_nic_vport_context(mdev, 0, out);
+       err = mlx5_query_nic_vport_context(mdev, 0, out);
+       if (err)
+               goto out;
 
        *system_image_guid = MLX5_GET64(query_nic_vport_context_out, out,
                                        nic_vport_context.system_image_guid);
-
+out:
        kvfree(out);
-
-       return 0;
+       return err;
 }
 EXPORT_SYMBOL_GPL(mlx5_query_nic_vport_system_image_guid);
 
@@ -1133,19 +1135,20 @@ EXPORT_SYMBOL_GPL(mlx5_nic_vport_unaffiliate_multiport);
 u64 mlx5_query_nic_system_image_guid(struct mlx5_core_dev *mdev)
 {
        int port_type_cap = MLX5_CAP_GEN(mdev, port_type);
-       u64 tmp = 0;
+       u64 tmp;
+       int err;
 
        if (mdev->sys_image_guid)
                return mdev->sys_image_guid;
 
        if (port_type_cap == MLX5_CAP_PORT_TYPE_ETH)
-               mlx5_query_nic_vport_system_image_guid(mdev, &tmp);
+               err = mlx5_query_nic_vport_system_image_guid(mdev, &tmp);
        else
-               mlx5_query_hca_vport_system_image_guid(mdev, &tmp);
+               err = mlx5_query_hca_vport_system_image_guid(mdev, &tmp);
 
-       mdev->sys_image_guid = tmp;
+       mdev->sys_image_guid = err ? 0 : tmp;
 
-       return tmp;
+       return mdev->sys_image_guid;
 }
 EXPORT_SYMBOL_GPL(mlx5_query_nic_system_image_guid);