[PATCH 4.9 35/59] net/mlx5e: Remove WARN_ONCE from adaptive moderation code

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gil Rockah <g...@mellanox.com>


[ Upstream commit 0bbcc0a8fc394d01988fe0263ccf7fddb77a12c3 ]

When trying to do interface down or changing interface configuration
under heavy traffic, some of the adaptive moderation corner cases can
occur and leave a WARN_ONCE call trace in the kernel log.

Those WARN_ONCE are meant for debug only, and should have been inserted
only under debug. We avoid such call traces by removing those WARN_ONCE.

Fixes: cb3c7fd4f839 ("net/mlx5e: Support adaptive RX coalescing")
Signed-off-by: Gil Rockah <g...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
@@ -109,7 +109,6 @@ static bool mlx5e_am_on_top(struct mlx5e
        switch (am->tune_state) {
        case MLX5E_AM_PARKING_ON_TOP:
        case MLX5E_AM_PARKING_TIRED:
-               WARN_ONCE(true, "mlx5e_am_on_top: PARKING\n");
                return true;
        case MLX5E_AM_GOING_RIGHT:
                return (am->steps_left > 1) && (am->steps_right == 1);
@@ -123,7 +122,6 @@ static void mlx5e_am_turn(struct mlx5e_r
        switch (am->tune_state) {
        case MLX5E_AM_PARKING_ON_TOP:
        case MLX5E_AM_PARKING_TIRED:
-               WARN_ONCE(true, "mlx5e_am_turn: PARKING\n");
                break;
        case MLX5E_AM_GOING_RIGHT:
                am->tune_state = MLX5E_AM_GOING_LEFT;
@@ -144,7 +142,6 @@ static int mlx5e_am_step(struct mlx5e_rx
        switch (am->tune_state) {
        case MLX5E_AM_PARKING_ON_TOP:
        case MLX5E_AM_PARKING_TIRED:
-               WARN_ONCE(true, "mlx5e_am_step: PARKING\n");
                break;
        case MLX5E_AM_GOING_RIGHT:
                if (am->profile_ix == (MLX5E_PARAMS_AM_NUM_PROFILES - 1))
@@ -282,10 +279,8 @@ static void mlx5e_am_calc_stats(struct m
        u32 delta_us = ktime_us_delta(end->time, start->time);
        unsigned int npkts = end->pkt_ctr - start->pkt_ctr;
 
-       if (!delta_us) {
-               WARN_ONCE(true, "mlx5e_am_calc_stats: delta_us=0\n");
+       if (!delta_us)
                return;
-       }
 
        curr_stats->ppms =            (npkts * USEC_PER_MSEC) / delta_us;
        curr_stats->epms = (MLX5E_AM_NEVENTS * USEC_PER_MSEC) / delta_us;