igb: Reject requests that fail to enable time stamping on both edges.

This hardware always time stamps rising and falling edges, and so this
patch validates that the request does contains both edges.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index 3fd60715bca7482c8b877f7bb435d2253cc4a3f7..c39e921757ba9cf305a946bb104efe182c0f9ff4 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -528,6 +528,12 @@ static int igb_ptp_feature_enable_i210(struct ptp_clock_info *ptp,
                                        PTP_STRICT_FLAGS))
                        return -EOPNOTSUPP;
 
+               /* Reject requests failing to enable both edges. */
+               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);