netdev - Re: [PATCH net 2/4] net: ethernet: dnet: don't call dev_kfree_skb() under spin_lock

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Message-ID: <CANn89i+dFBt_iMfEua0zvdin684HrCUR7t2a1qedk-n-mk2V2Q@mail.gmail.com>
Date:   Wed, 7 Dec 2022 11:34:29 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com
Subject: Re: [PATCH net 2/4] net: ethernet: dnet: don't call dev_kfree_skb()
 under spin_lock_irqsave()

On Wed, Dec 7, 2022 at 8:35 AM Yang Yingliang <yangyingliang@...wei.com> wrote:
>
> It is not allowed to call consume_skb() from hardware interrupt context
> or with interrupts being disabled. So replace dev_kfree_skb() with
> dev_consume_skb_irq() under spin_lock_irqsave().
>
> Fixes: 4796417417a6 ("dnet: Dave DNET ethernet controller driver (updated)")
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/net/ethernet/dnet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/dnet.c b/drivers/net/ethernet/dnet.c
> index 08184f20f510..1da10c79fb97 100644
> --- a/drivers/net/ethernet/dnet.c
> +++ b/drivers/net/ethernet/dnet.c
> @@ -551,7 +551,7 @@ static netdev_tx_t dnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
>         skb_tx_timestamp(skb);
>
>         /* free the buffer */
> -       dev_kfree_skb(skb);
> +       dev_consume_skb_irq(skb);
>
>         spin_unlock_irqrestore(&bp->lock, flags);

What about moving the dev_kfree_skb() after spin_unlock_irqrestore() ?


>
> --
> 2.25.1
>