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 17:03:20 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
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 2022/12/8 16:51, Leon Romanovsky wrote:
> On Thu, Dec 08, 2022 at 04:40:35PM +0800, Yang Yingliang wrote:
>> On 2022/12/8 15:56, Leon Romanovsky wrote:
>>> 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()?
>> I chose dev_consume_skb_irq(), because dev_kfree_skb() is consume_skb().
> Your commit message, title and actual change are totally misleading.
> You replaced *_kfree_* with *_consume_* while talking about running it
> in interrupts disabled context.
I didn't mention dev_kfree_skb() is same as consume_skb(), I can add it 
to my
commit message and send a new version.

Thanks,
Yang
>
> Thanks
>
>> Thanks,
>> Yang
>>> Thanks
>>>
>>>>    				cnt++;
>>>>    			}
>>>>    		}
>>>> -- 
>>>> 2.25.1
>>>>
>>> .
> .