linux-kernel - [PATCH 5.12 120/296] net/mlx5e: Fix error path of updating netdev queues

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Message-Id: <20210531130707.947355601@linuxfoundation.org>
Date:   Mon, 31 May 2021 15:12:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Aya Levin <ayal@...dia.com>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH 5.12 120/296] net/mlx5e: Fix error path of updating netdev queues

From: Aya Levin <ayal@...dia.com>

commit 5e7923acbd86d0ff29269688d8a9c47ad091dd46 upstream.

Avoid division by zero in the error flow. In the driver TC number can be
either 1 or 8. When TC count is set to 1, driver zero netdev->num_tc.
Hence, need to convert it back from 0 to 1 in the error flow.

Fixes: fa3748775b92 ("net/mlx5e: Handle errors from netif_set_real_num_{tx,rx}_queues")
Signed-off-by: Aya Levin <ayal@...dia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3027,7 +3027,7 @@ static int mlx5e_update_netdev_queues(st
 	int err;
 
 	old_num_txqs = netdev->real_num_tx_queues;
-	old_ntc = netdev->num_tc;
+	old_ntc = netdev->num_tc ? : 1;
 
 	nch = priv->channels.params.num_channels;
 	ntc = priv->channels.params.num_tc;