net/mlx4: fix returned values upon failed probing

Let error messages in place, but return unambiguous values upon
probing errors.

Fixes: 66e1591687ac ("mlx4: avoid init errors when kernel modules are not loaded")
Cc: stable@dpdk.org
Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 45b5269..ff903e6 100644 (file)
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -5524,10 +5524,8 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
        list = ibv_get_device_list(&i);
        if (list == NULL) {
                assert(errno);
-               if (errno == ENOSYS) {
-                       WARN("cannot list devices, is ib_uverbs loaded?");
-                       return 0;
-               }
+               if (errno == ENOSYS)
+                       ERROR("cannot list devices, is ib_uverbs loaded?");
                return -errno;
        }
        assert(i >= 0);
@@ -5559,11 +5557,11 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
                ibv_free_device_list(list);
                switch (err) {
                case 0:
-                       WARN("cannot access device, is mlx4_ib loaded?");
-                       return 0;
+                       ERROR("cannot access device, is mlx4_ib loaded?");
+                       return -ENODEV;
                case EINVAL:
-                       WARN("cannot use device, are drivers up to date?");
-                       return 0;
+                       ERROR("cannot use device, are drivers up to date?");
+                       return -EINVAL;
                }
                assert(err > 0);
                return -err;