linux-kernel - [PATCH 4.20 002/127] mlxsw: spectrum: Disable lag port TX before removing it

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Date:   Thu, 24 Jan 2019 20:19:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.20 002/127] mlxsw: spectrum: Disable lag port TX before removing it

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

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

From: Jiri Pirko <jiri@...lanox.com>

[ Upstream commit 8adbe212a159d9c78a90fca1d854f6e63452426b ]

Make sure that lag port TX is disabled before mlxsw_sp_port_lag_leave()
is called and prevent from possible EMAD error.

Fixes: 0d65fc13042f ("mlxsw: spectrum: Implement LAG port join/leave")
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -4738,12 +4738,15 @@ static int mlxsw_sp_netdevice_port_upper
 							   lower_dev,
 							   upper_dev);
 		} else if (netif_is_lag_master(upper_dev)) {
-			if (info->linking)
+			if (info->linking) {
 				err = mlxsw_sp_port_lag_join(mlxsw_sp_port,
 							     upper_dev);
-			else
+			} else {
+				mlxsw_sp_port_lag_tx_en_set(mlxsw_sp_port,
+							    false);
 				mlxsw_sp_port_lag_leave(mlxsw_sp_port,
 							upper_dev);
+			}
 		} else if (netif_is_ovs_master(upper_dev)) {
 			if (info->linking)
 				err = mlxsw_sp_port_ovs_join(mlxsw_sp_port);