dp83640: Reject requests to enable time stamping on both edges.

This driver enables rising edge or falling edge, but not both, and so
this patch validates that the request contains only one of the two
edges.

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

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 3bba2bea3a885c14e8a59605ba782ad7b95ab720..8f241b57fcf65b0d5872fede555c2ab761a358d3 100644 (file)
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -475,6 +475,13 @@ static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
                                        PTP_FALLING_EDGE |
                                        PTP_STRICT_FLAGS))
                        return -EOPNOTSUPP;
+
+               /* Reject requests to enable time stamping on 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;
+
                index = rq->extts.index;
                if (index >= N_EXT_TS)
                        return -EINVAL;