1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index d59f75b7bf16..f680c87254ba 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3617,6 +3617,13 @@ e1000_set_spd_dplx(struct e1000_adapter *adapter, uint16_t spddplx)
 {
         adapter->hw.autoneg = 0;
 
+        /* Fiber NICs only allow 1000 gbps Full duplex */
+        if((adapter->hw.media_type == e1000_media_type_fiber) &&
+                spddplx != (SPEED_1000 + DUPLEX_FULL)) {
+                DPRINTK(PROBE, ERR, "Unsupported Speed/Duplex configuration\n");
+                return -EINVAL;
+        }
+
         switch(spddplx) {
         case SPEED_10 + DUPLEX_HALF:
                 adapter->hw.forced_speed_duplex = e1000_10_half;