linux-kernel - Re: [PATCH] notifier: Return an error when a callback has already been registered

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Date:   Thu, 2 Dec 2021 15:31:49 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] notifier: Return an error when a callback has already
 been registered

On 2021-12-02 15:23:36 [+0100], Borislav Petkov wrote:
> On Thu, Dec 02, 2021 at 03:16:30PM +0100, Sebastian Andrzej Siewior wrote:
> > >  	while ((*nl) != NULL) {
> > > -		if (unlikely((*nl) == n)) {
> > > -			WARN(1, "double register detected");
> > > -			return 0;
> > 
> > This could be s/0/-EEXIST/ or do I miss something?
> 
> It is...
…
> > > -		}
> > > +		if (unlikely((*nl) == n))
> > > +			return -EEXIST;
> 			^^^^^^^^^^^^^^^
> 
> ... right here.

I meant without the extra function. I'm fine either way, just curious :)

Sebastian