1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 55edcb74abf4..5b04eff2fd23 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -6115,6 +6115,13 @@ int igb_set_spd_dplx(struct igb_adapter *adapter, u16 spddplx)
 
         mac->autoneg = 0;
 
+        /* Fiber NIC's only allow 1000 Gbps Full duplex */
+        if ((adapter->hw.phy.media_type == e1000_media_type_internal_serdes) &&
+                spddplx != (SPEED_1000 + DUPLEX_FULL)) {
+                dev_err(&pdev->dev, "Unsupported Speed/Duplex configuration\n");
+                return -EINVAL;
+        }
+
         switch (spddplx) {
         case SPEED_10 + DUPLEX_HALF:
                 mac->forced_speed_duplex = ADVERTISE_10_HALF;