netdev - Re: [PATCH net v2] ethernet: s2io: don't call dev_kfree_skb() under spin_lock

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Date:   Thu, 8 Dec 2022 09:56:26 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     netdev@...r.kernel.org, jdmason@...zu.us, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net v2] ethernet: s2io: don't call dev_kfree_skb() under
 spin_lock_irqsave()

On Wed, Dec 07, 2022 at 09:25:40AM +0800, Yang Yingliang 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: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
> v1 -> v2:
>   Add fix tag.
> ---
>  drivers/net/ethernet/neterion/s2io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c
> index 1d3c4474b7cb..a83d61d45936 100644
> --- a/drivers/net/ethernet/neterion/s2io.c
> +++ b/drivers/net/ethernet/neterion/s2io.c
> @@ -2386,7 +2386,7 @@ static void free_tx_buffers(struct s2io_nic *nic)
>  			skb = s2io_txdl_getskb(&mac_control->fifos[i], txdp, j);
>  			if (skb) {
>  				swstats->mem_freed += skb->truesize;
> -				dev_kfree_skb(skb);
> +				dev_consume_skb_irq(skb);

And why did you use dev_consume_skb_irq() and not dev_kfree_skb_irq()?

Thanks

>  				cnt++;
>  			}
>  		}
> -- 
> 2.25.1
>