netdev - Re: [PATCH net-next] net: lantiq_etop: add blank line after declaration

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Date:   Sat, 8 Jan 2022 16:38:59 +0100
From:   Aleksander Bajkowski <olek2@...pl>
To:     Joe Perches <joe@...ches.com>, davem@...emloft.net,
        kuba@...nel.org, rdunlap@...radead.org, jgg@...pe.ca,
        arnd@...db.de, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     John Crispin <john@...ozen.org>
Subject: Re: [PATCH net-next] net: lantiq_etop: add blank line after
 declaration

Hi Joe,

On 1/8/22 09:04, Joe Perches wrote:
> (adding John Crispin, the original submitter of this driver)
> 
> On Tue, 2021-12-28 at 23:00 +0100, Aleksander Jan Bajkowski wrote:
>> This patch adds a missing line after the declaration and
>> fixes the checkpatch warning:
>>
>> WARNING: Missing a blank line after declarations
>> +		int desc;
>> +		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
>>
>> Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>
> []
>> diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
> []
>> @@ -218,6 +218,7 @@ ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
>>  		free_irq(ch->dma.irq, priv);
>>  	if (IS_RX(ch->idx)) {
>>  		int desc;
>> +
>>  		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
>>  			dev_kfree_skb_any(ch->skb[ch->dma.desc]);
>>  	}
> 
> The change is innocuous and has already been applied but the code
> doesn't seem to make sense.
> 
> Why is dev_kfree_skb_any called multiple times with the same argument?
> 
> Is there some missing logic here?  Maybe a missing ++?
> 
> Something like:
> 
> 		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
>  			dev_kfree_skb_any(ch->skb[ch->dma.desc++]);
> 
> Dunno, but the current code seems wrong.
> 
> 


FYI: This driver is mainly used by OpenWRT. OpenWRT has two
patches that were never upstreamed. One of them is called
"various etop fixes" and I would expect more bugs in this driver.
The part that adds support for ar9 must be rewritten before
upstreaming. This SoC has a built-in 2 port switch and needs
a DSA driver. The rest of the fixes in this patch can probably
be sent upstream.


1. https://github.com/abajk/openwrt/blob/master/target/linux/lantiq/patches-5.10/0028-NET-lantiq-various-etop-fixes.patch
2. https://github.com/abajk/openwrt/blob/master/target/linux/lantiq/patches-5.10/0701-NET-lantiq-etop-of-mido.patch