linux-kernel - [PATCH] net/mlx5e: Removed useless code in function

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Message-Id: <20220711093303.14511-1-subkhankulov@ispras.ru>
Date:   Mon, 11 Jul 2022 12:33:03 +0300
From:   Rustam Subkhankulov <subkhankulov@...ras.ru>
To:     Saeed Mahameed <saeedm@...dia.com>
Cc:     Rustam Subkhankulov <subkhankulov@...ras.ru>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maor Gottlieb <maorg@...lanox.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>
Subject: [PATCH] net/mlx5e: Removed useless code in function

Comparison of eth_ft->ft with NULL is useless, because
get_flow_table() returns either pointer 'eth_ft'
such that eth_ft->ft != NULL, or an erroneous value that is
handled on return, causing mlx5e_ethtool_flow_replace()
to terminate before checking whether eth_ft->ft equals NULL.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Rustam Subkhankulov <subkhankulov@...ras.ru>
Fixes: 6dc6071cfcde ("net/mlx5e: Add ethtool flow steering support")
---
 drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c
index ad0d234632a3..9466202fd97b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c
@@ -742,10 +742,7 @@ mlx5e_ethtool_flow_replace(struct mlx5e_priv *priv,
 
 	eth_rule->flow_spec = *fs;
 	eth_rule->eth_ft = eth_ft;
-	if (!eth_ft->ft) {
-		err = -EINVAL;
-		goto del_ethtool_rule;
-	}
+
 	rule = add_ethtool_flow_rule(priv, eth_rule, eth_ft->ft, fs, rss_context);
 	if (IS_ERR(rule)) {
 		err = PTR_ERR(rule);
-- 
2.25.1