net/mlx5e: Revert parameters on errors when changing PTP state without reset

[ Upstream commit 74640f09735f935437bd8df9fe61a66f03eabb34 ]

Port timestamping for PTP can be enabled/disabled while the channels are
closed. In that case mlx5e_safe_switch_channels is skipped, and the
preactivate hook is called directly. However, if that hook returns an
error, the channel parameters must be reverted back to their old values.
This commit adds missing handling on this case.

Fixes: 145e5637d941 ("net/mlx5e: Add TX PTP port object support")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 8612c388db7d39864851e454f7fa88cec77b2df6..fdf5afc8b05894c562e65601e5cfe90b69d007cc 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1993,8 +1993,13 @@ static int set_pflag_tx_port_ts(struct net_device *netdev, bool enable)
         */
 
        if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
+               struct mlx5e_params old_params;
+
+               old_params = priv->channels.params;
                priv->channels.params = new_channels.params;
                err = mlx5e_num_channels_changed(priv);
+               if (err)
+                       priv->channels.params = old_params;
                goto out;
        }