[dpdk-stable] [PATCH v2 1/2] net/mlx4: fix returned values upon failed probing

[Gaetan Rivet <gaetan.rivet@6wind.com>]

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>
---
 drivers/net/mlx4/mlx4.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 4427ca3..350b2f4 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -5521,10 +5521,8 @@ 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);
@@ -5556,11 +5554,11 @@ 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;
-- 
2.1.4