linux-kernel - Re: [PATCH net] tipc: Return non-zero value from tipc_udp

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Message-ID: <c87f411c-ad0e-4c14-b437-8191db438531@redhat.com>
Date: Tue, 16 Jul 2024 15:10:22 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Tung Nguyen <tung.q.nguyen@...ava.com>,
 Shigeru Yoshida <syoshida@...hat.com>
Cc: "jmaloy@...hat.com" <jmaloy@...hat.com>,
 "ying.xue@...driver.com" <ying.xue@...driver.com>,
 "davem@...emloft.net" <davem@...emloft.net>,
 "edumazet@...gle.com" <edumazet@...gle.com>,
 "kuba@...nel.org" <kuba@...nel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "tipc-discussion@...ts.sourceforge.net"
 <tipc-discussion@...ts.sourceforge.net>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] tipc: Return non-zero value from tipc_udp_addr2str()
 on error

On 7/16/24 13:43, Tung Nguyen wrote:
> 
>> I think that consistency with other tipc helpers here would be more
>> appropriate: IMHO no need to send a v2.
>>
> I do not think so. If you look at other helper functions for udp media, they use predefined error codes, for example:
> tipc_udp_msg2addr()
> {
>   ...
> return -EINVAL;
>   ...
> }

It's not a big deal really, but, as noted by Shigeru, all the other 
tipc_*_addr2str() callbacks return 1 on error and such callback is 
invoked via function pointer.

If only this one returns a negative error, modification to the function 
pointer callsite will become prone to errors (and stable backports more 
fragiles)

Cheers,

Paolo