diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c index f945705561200..f323e1c1989f1 100644 --- a/drivers/net/ethernet/intel/igb/igb_ptp.c +++ b/drivers/net/ethernet/intel/igb/igb_ptp.c @@ -509,6 +509,12 @@ static int igb_ptp_feature_enable_82580(struct ptp_clock_info *ptp, PTP_STRICT_FLAGS)) return -EOPNOTSUPP; + /* Both the rising and falling edge are timestamped */ + if (rq->extts.flags & PTP_STRICT_FLAGS && + (rq->extts.flags & PTP_ENABLE_FEATURE) && + (rq->extts.flags & PTP_EXTTS_EDGES) != PTP_EXTTS_EDGES) + return -EOPNOTSUPP; + if (on) { pin = ptp_find_pin(igb->ptp_clock, PTP_PF_EXTTS, rq->extts.index);