[PATCH 4.19 095/264] net/mlx5: Dont call timecounter cyc2time directly from 1PPS flow

Greg Kroah-Hartman
2020-10-27T14:22:24Z

From: Eran Ben Elisha <eranbe@mellanox.com>

[ Upstream commit 0d2ffdc8d4002a62de31ff7aa3bef28c843c3cbe ]

Before calling timecounter_cyc2time(), clock->lock must be taken.
Use mlx5_timecounter_cyc2time instead which guarantees a safe access.

Fixes: afc98a0b46d8 ("net/mlx5: Update ptp_clock_event foreach PPS event")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index d359e850dbf07..0fd62510fb277 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -475,8 +475,9 @@ void mlx5_pps_event(struct mlx5_core_dev *mdev,
switch (clock->ptp_info.pin_config[pin].func) {
case PTP_PF_EXTTS:
ptp_event.index = pin;
- ptp_event.timestamp = timecounter_cyc2time(&clock->tc,
- be64_to_cpu(eqe->data.pps.time_stamp));
+ ptp_event.timestamp =
+ mlx5_timecounter_cyc2time(clock,
+ be64_to_cpu(eqe->data.pps.time_stamp));
if (clock->pps_info.enabled) {
ptp_event.type = PTP_CLOCK_PPSUSR;
ptp_event.pps_times.ts_real =
--
2.25.1