mlx5: 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>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index 819097d..43f9760 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -243,6 +243,12 @@ static int mlx5_extts_configure(struct ptp_clock_info *ptp,
                                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;
+
        if (rq->extts.index >= clock->ptp_info.n_pins)
                return -EINVAL;