linux-kernel - Re: [PATCH] nfp: flower: Added pointer check and continue.

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Message-ID: <ZVsFBACC05VrrCfw@LouisNoVo>
Date:   Mon, 20 Nov 2023 09:04:36 +0200
From:   Louis Peens <louis.peens@...igine.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Denis Arefev <arefev@...mel.ru>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, oss-drivers@...igine.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] nfp: flower: Added pointer check and continue.

On Sat, Nov 18, 2023 at 08:22:07PM -0800, Jakub Kicinski wrote:
> On Fri, 17 Nov 2023 16:27:17 +0200 Louis Peens wrote:
> > >                 acti_netdevs = kmalloc_array(entry->slave_cnt,
> > >                                              sizeof(*acti_netdevs), GFP_KERNEL);
> > > 
> 
> Unnecessary new line, please remove it.
> There should be no empty lines between call and error check.
> 
> > > +               if (!acti_netdevs) {
> > > +                       schedule_delayed_work(&lag->work, NFP_FL_LAG_DELAY);
> > > +                       continue;
> > > +               }
> > > +  
> > Thanks for reporting this Denis, it definitely seems to be an oversight.
> > Would you mind adding a 'nfp_flower_cmsg_warn' here as well, so that
> > this case does not go undetected? Maybe something like "cannot
> > allocate memory for group processing" can work.
> 
> There's a checkpatch check against printing warnings on allocation
> failures. Kernel will complain loudly on OOM, anyway, there's no need
> for a local print.
Ah, thanks Jakub, I did not know that this is frowned upon. But I have
not thought about OOM - it would indeed not be a silent failure.

In that case I would be quite happy to add my Ack to v2 with the newline
comment addressed.
> -- 
> pw-bot: cr