IB/mlx4: Don't register IB device for adapters with no IB ports

If the mlx4_ib driver finds an adapter that has only ethernet ports, the
current code will register an IB device with 0 ports.  Nothing useful or
sensible can be done with such a device, so just skip registering it.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index dcefe1fceb5c..61588bd273bd 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -543,14 +543,21 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
 {
         static int mlx4_ib_version_printed;
         struct mlx4_ib_dev *ibdev;
+        int num_ports = 0;
         int i;
 
-
         if (!mlx4_ib_version_printed) {
                 printk(KERN_INFO "%s", mlx4_ib_version);
                 ++mlx4_ib_version_printed;
         }
 
+        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_IB)
+                num_ports++;
+
+        /* No point in registering a device with no ports... */
+        if (num_ports == 0)
+                return NULL;
+
         ibdev = (struct mlx4_ib_dev *) ib_alloc_device(sizeof *ibdev);
         if (!ibdev) {
                 dev_err(&dev->pdev->dev, "Device struct alloc failed\n");
@@ -574,9 +581,7 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
         ibdev->ib_dev.owner             = THIS_MODULE;
         ibdev->ib_dev.node_type         = RDMA_NODE_IB_CA;
         ibdev->ib_dev.local_dma_lkey    = dev->caps.reserved_lkey;
-        ibdev->num_ports = 0;
-        mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_IB)
-                ibdev->num_ports++;
+        ibdev->num_ports                = num_ports;
         ibdev->ib_dev.phys_port_cnt     = ibdev->num_ports;
         ibdev->ib_dev.num_comp_vectors  = dev->caps.num_comp_vectors;
         ibdev->ib_dev.dma_device        = &dev->pdev->dev;