linux-kernel - Re: [PATCH] x25: remove redundant pointer dev

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Message-ID: <CAADfD8zwoGUw4aJ8ebz9sLYyZSGp8Au6y5QvpFPvV9Rc4HY_Aw@mail.gmail.com>
Date:   Mon, 9 May 2022 20:48:39 +0400
From:   Ozgur <ozgurk@...e.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Colin Ian King <colin.i.king@...il.com>,
        Martin Schiller <ms@....tdt.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-x25@...r.kernel.org,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x25: remove redundant pointer dev

On Mon, May 9, 2022 at 4:44 PM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> On Mon, May 09, 2022 at 04:57:40AM +0400, Ozgur wrote:
> > On Mon, May 9, 2022 at 1:45 AM Colin Ian King <colin.i.king@...il.com> wrote:
> > >
> > > Pointer dev is being assigned a value that is never used, the assignment
> > > and the variable are redundant and can be removed. Also replace null check
> > > with the preferred !ptr idiom.
> > >
> >
> > Hello,
> >
> > *dev pointer is device assign global linked list and shouldnt be
> > touched by the driver so *dev wont get any value right?
>
> Why are you talking about "*dev" instead of "dev"?
>

Hi Dan,
I just realized this, i thought dev was necessary for launch functions
device and to activate.
if carries this with x25, dev is useless I understand.

> > Also seems to use this while network interface is initializing because
> > some activation information and stats information is also kept here,
> > for example, open *dev will call when ifconfig is called from.
> >
> > route, link, forward these inital activate and move all values with
> > net_device *dev?
>
> It's not clear what you are saying...
>
> When I review these kinds of patches I ask:
> 1) Does Colin's patch change run time behavior?  Obviosly not.
> 2) Is the current code buggy?  Sometimes when there is a static checker
>    warning it indicates a typo in the code.  I do not see a bug in the
>    original code before Colin's patch.
> 3) What was the author's original intent?  This code predates git but
>    I think the "dev" was just a going to be a shorter name to type than
>    "x25->neighbour->dev".

Actually i thought similarly because when this patch remove dev from i
thought would depend on
other source code whose x25 interface will be implemented are not ready.

I thought any x25 interface or x25route was using it.

> I honestly have no idea what you are saying.  At first I thought you
> might be saying that this is stub code.  But that seems wrong.  Also we
> do not allow stub code in the kernel.

thanks for enlightening,

Regards

> regards,
> dan carpenter
>


-- 
Ozgur Kara
Linux Kernel Developer

ozgurk@...e.org