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

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Message-Id: <20200902.125257.1961904187228004830.davem@davemloft.net>
Date:   Wed, 02 Sep 2020 12:52:57 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     luobin9@...wei.com
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: Re: [PATCH net 3/3] hinic: fix bug of send pkts while setting
 channels

From: Luo bin <luobin9@...wei.com>
Date: Wed, 2 Sep 2020 17:41:45 +0800

> @@ -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;
> +	}

As Eric said, these kinds of tests should not be placed in the fast path
of the driver.

If you invoke close and the core networking still sends packets to the
driver, that's a bug that needs to be fixed in the core networking.