net/mlx5: fix meter profile delete after disable

[ upstream commit 9b7fcf3 ]

If a meter's profile is changed after meter disabled, there's an issue
that will fail when deleting the old profile.

This patch fixes this by adding the correct process to decrease the old
profile's reference count when changing profile.

Fixes: 63ffeb2 ("net/mlx5: support meter profile update")

Signed-off-by: Shun Hao <shunh@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

drivers/net/mlx5/mlx5_flow_meter.c

@@ -1624,7 +1624,7 @@ mlx5_flow_meter_profile_update(struct rte_eth_dev *dev,
 	fm->profile = fmp;
 	/* Update meter params in HW (if not disabled). */
 	if (fm->active_state == MLX5_FLOW_METER_DISABLE)
-		return 0;
+		goto dec_ref_cnt;
 	ret = mlx5_flow_meter_action_modify(priv, fm, &fm->profile->srtcm_prm,
 					      modify_bits, fm->active_state, 1);
 	if (ret) {
@@ -1634,6 +1634,7 @@ mlx5_flow_meter_profile_update(struct rte_eth_dev *dev,
 					  NULL, "Failed to update meter"
 					  " parameters in hardware.");
 	}
+dec_ref_cnt:
 	old_fmp->ref_cnt--;
 	fmp->ref_cnt++;
 	return 0;