1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 48eda16db1a7..9b5e11d3fb85 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -2402,7 +2402,18 @@ static ssize_t dev_id_show(struct device *dev,
 {
         struct net_device *ndev = to_net_dev(dev);
 
-        if (ndev->dev_id == ndev->dev_port)
+        /*
+         * ndev->dev_port will be equal to 0 in old kernel prior to commit
+         * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
+         * port numbers") Zero was chosen as special case for user space
+         * applications to fallback and query dev_id to check if it has
+         * different value or not.
+         *
+         * Don't print warning in such scenario.
+         *
+         * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
+         */
+        if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
                 netdev_info_once(ndev,
                         "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
                         current->comm);