linux-kernel - Re: [PATCH] net/ipv4: return the real errno instead of -EINVAL

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Message-Id: <20230807020525.248349-1-xu.xin16@zte.com.cn>
Date:   Mon,  7 Aug 2023 02:05:25 +0000
From:   xu <xu.xin.sc@...il.com>
To:     vadim.fedorenko@...ux.dev
Cc:     davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, yang.yang29@....com.cn,
        xu.xin16@....com.cn, si.hao@....com.cn, dai.shixin@....com.cn
Subject: Re: [PATCH] net/ipv4: return the real errno instead of -EINVAL

>> @@ -236,7 +234,8 @@ static int ip_finish_output2(struct net *net, struct sock *sk, struct sk_buff *s
>>   	net_dbg_ratelimited("%s: No header cache and no neighbour!\n",
>>   			    __func__);
>>   	kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_CREATEFAIL);
>> -	return -EINVAL;
>> +	res = PTR_ERR(neigh);
>> +	return res;
>
>I believe this part could be written as
>
>-	return -EINVAL;
>+	return PTR_ERR(neigh);
>
>
>and there is no need to change the code is other places. This will be
>easier to track/backport.

Sure, I initially wrote the same thing with you, but considering the convenience of maintainer review,
I deliberately modified some other parts of the code to present a clear context of the core
modifications.

>From your reply, I can see you agree with my key idea of this patch, so I have sent a v2 patch[1] according
to your view.

[1] https://lore.kernel.org/all/20230807015408.248237-1-xu.xin16@zte.com.cn/