netdev - Re: [PATCH] can: j1939: transport: replace kfree_skb() with dev_kfree_skb

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Date:   Thu, 27 Oct 2022 10:06:29 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        robin@...tonic.nl, linux@...pel-privat.de, kernel@...gutronix.de,
        socketcan@...tkopp.net
Subject: Re: [PATCH] can: j1939: transport: replace kfree_skb() with
 dev_kfree_skb_irq()

On 26.10.2022 20:53:54, Yang Yingliang wrote:
> It is not allowed to call kfree_skb() from hardware interrupt
> context or with interrupts being disabled. So replace kfree_skb()
> with dev_kfree_skb_irq() under spin_lock_irqsave().
> 
> Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  net/can/j1939/transport.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
> index d7d86c944d76..b95fb759c49d 100644
> --- a/net/can/j1939/transport.c
> +++ b/net/can/j1939/transport.c
> @@ -343,7 +343,7 @@ static void j1939_session_skb_drop_old(struct j1939_session *session)
>  		/* drop ref taken in j1939_session_skb_queue() */
>  		skb_unref(do_skb);
>  
> -		kfree_skb(do_skb);
> +		dev_kfree_skb_irq(do_skb);

Can you call spin_unlock_irqrestore() before the kfree_skb()? Does that
fix the problem?

>  	}
>  	spin_unlock_irqrestore(&session->skb_queue.lock, flags);
>  }

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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