release/5.2.56/net-mlx5e-Fix-error-path-of-device-attach.patch

From 0e19c140d37fbc36ccab5f9619110ea0dbc935e4 Mon Sep 17 00:00:00 2001
From: Aya Levin <ayal@mellanox.com>
Date: Wed, 1 Jul 2020 12:21:53 +0300
Subject: [PATCH] net/mlx5e: Fix error path of device attach

commit 5cd39b6e9a420329a9a408894be7ba8aa7dd755e upstream.

On failure to attach the netdev, fix the rollback by re-setting the
device's state back to MLX5E_STATE_DESTROYING.

Failing to attach doesn't stop statistics polling via .ndo_get_stats64.
In this case, although the device is not attached, it falsely continues
to query the firmware for counters. Setting the device's state back to
MLX5E_STATE_DESTROYING prevents the firmware counters query.

Fixes: 26e59d8077a3 ("net/mlx5e: Implement mlx5e interface attach/detach callbacks")
Signed-off-by: Aya Levin <ayal@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 5f33074d4094..180b74b34f9a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -5071,6 +5071,8 @@ int mlx5e_attach_netdev(struct mlx5e_priv *priv)
 	profile->cleanup_tx(priv);
 
 out:
+	set_bit(MLX5E_STATE_DESTROYING, &priv->state);
+	cancel_work_sync(&priv->update_stats_work);
 	return err;
 }
 
-- 
2.27.0