linux-kernel - Re: [PATCH net v1] hinic: fix rewaking txq after netif_tx

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Date:   Fri, 11 Sep 2020 17:24:58 -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 v1] hinic: fix rewaking txq after netif_tx_disable

From: Luo bin <luobin9@...wei.com>
Date: Thu, 10 Sep 2020 22:04:40 +0800

> When calling hinic_close in hinic_set_channels, all queues are
> stopped after netif_tx_disable, but some queue may be rewaken in
> free_tx_poll by mistake while drv is handling tx irq. If one queue
> is rewaken core may call hinic_xmit_frame to send pkt after
> netif_tx_disable within a short time which may results in accessing
> memory that has been already freed in hinic_close. So we call
> napi_disable before netif_tx_disable in hinic_close to fix this bug.
> 
> Fixes: 2eed5a8b614b ("hinic: add set_channels ethtool_ops support")
> Signed-off-by: Luo bin <luobin9@...wei.com>
> ---
> V0~V1:
> - call napi_disable before netif_tx_disable instead of judging whether
>   the netdev is in down state before waking txq in free_tx_poll to fix
>   this bug

Applied and queued up for -stable, thank you.