netdev - Re: [PATCH net v2 1/2] net: apple: mace: don't call dev_kfree_skb() under spin_lock

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Message-ID: <0d01feea-973a-0331-e669-bc362ba93f56@huawei.com>
Date:   Thu, 8 Dec 2022 16:39:03 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>
Subject: Re: [PATCH net v2 1/2] net: apple: mace: don't call dev_kfree_skb()
 under spin_lock_irqsave()


On 2022/12/8 15:58, Leon Romanovsky wrote:
> On Wed, Dec 07, 2022 at 09:29:58AM +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 a fix tag.
>> ---
>>   drivers/net/ethernet/apple/mace.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/apple/mace.c b/drivers/net/ethernet/apple/mace.c
>> index d0a771b65e88..77b4ed05140b 100644
>> --- a/drivers/net/ethernet/apple/mace.c
>> +++ b/drivers/net/ethernet/apple/mace.c
>> @@ -846,7 +846,7 @@ static void mace_tx_timeout(struct timer_list *t)
>>       if (mp->tx_bad_runt) {
>>   	mp->tx_bad_runt = 0;
>>       } else if (i != mp->tx_fill) {
>> -	dev_kfree_skb(mp->tx_bufs[i]);
>> +	dev_consume_skb_irq(mp->tx_bufs[i]);
> Same question, why did you chose dev_consume_skb_irq and not dev_kfree_skb_irq?
I chose dev_consume_skb_irq(), because dev_kfree_skb() is consume_skb().

Thanks,
Yang
>
> Thanks
>
>>   	if (++i >= N_TX_RING)
>>   	    i = 0;
>>   	mp->tx_empty = i;
>> -- 
>> 2.25.1
>>
> .