netdev - [PATCH net 3/3] hinic: fix bug of send pkts while setting channels

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Date:   Wed, 2 Sep 2020 17:41:45 +0800
From:   Luo bin <luobin9@...wei.com>
To:     <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <luoxianjun@...wei.com>, <yin.yinshi@...wei.com>,
        <cloud.wangxiaoyun@...wei.com>, <chiqijun@...wei.com>
Subject: [PATCH net 3/3] hinic: fix bug of send pkts while setting channels

When calling hinic_close in hinic_set_channels, netif_carrier_off
and netif_tx_disable are excuted, and TX host resources are freed
after that. Core may call hinic_xmit_frame to send pkt after
netif_tx_disable within a short time, so we should judge whether
carrier is on before sending pkt otherwise the resources that
have already been freed in hinic_close may be accessed.

Fixes: 2eed5a8b614b ("hinic: add set_channels ethtool_ops support")
Signed-off-by: Luo bin <luobin9@...wei.com>
---
 drivers/net/ethernet/huawei/hinic/hinic_tx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_tx.c b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
index a97498ee6914..a0662552a39c 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_tx.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
@@ -531,6 +531,11 @@ netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 	struct hinic_txq *txq;
 	struct hinic_qp *qp;
 
+	if (unlikely(!netif_carrier_ok(netdev))) {
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
 	txq = &nic_dev->txqs[q_id];
 	qp = container_of(txq->sq, struct hinic_qp, sq);
 
-- 
2.17.1