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-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_main.c13
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);