netdev - Re: [PATCH net-next 2/6] software node: allow named software node to be created

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Message-ID: <YtVSQI5VHtCOTCHc@smile.fi.intel.com>
Date:   Mon, 18 Jul 2022 15:29:52 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alvin __ipraga <alsi@...g-olufsen.dk>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Daniel Scally <djrscally@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        DENG Qingfang <dqfext@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        George McCollister <george.mccollister@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Sean Wang <sean.wang@...iatek.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Marek Behún <kabel@...nel.org>
Subject: Re: [PATCH net-next 2/6] software node: allow named software node to
 be created

On Fri, Jul 15, 2022 at 11:48:41PM +0300, Vladimir Oltean wrote:
> On Fri, Jul 15, 2022 at 11:33:40PM +0300, Andy Shevchenko wrote:
> > On Fri, Jul 15, 2022 at 11:17:15PM +0300, Vladimir Oltean wrote:
> > > On Fri, Jul 15, 2022 at 10:57:55PM +0300, Andy Shevchenko wrote:
> > > > On Fri, Jul 15, 2022 at 05:01:32PM +0100, Russell King wrote:
> > > > > From: Vladimir Oltean <vladimir.oltean@....com>
> > > > > 
> > > > > Allow a named software node to be created, which is needed for software
> > > > > nodes for a fixed-link specification for DSA.
> > > > 
> > > > In general I have no objection, but what's worrying me is a possibility to
> > > > collide in namespace. With the current code the name is generated based on
> > > > unique IDs, how can we make this one more robust?
> > > 
> > > Could you be more clear about the exact concern?
> > 
> > Each software node can be created with a name. The hierarchy should be unique,
> > means that there can't be two or more nodes with the same path (like on file
> > system or more specifically here, Device Tree). Allowing to pass names we may
> > end up with the situation when it will be a path collision. Yet, the static
> > names are easier to check, because one may run `git grep ...` or coccinelle
> > script to see what's in the kernel.
> 
> So won't kobject_init_and_add() fail on namespace collision? Is it the
> problem that it's going to fail, or that it's not trivial to statically
> determine whether it'll fail?
> 
> Sorry, but I don't see something actionable about this.

I'm talking about validation before a runtime. But if you think that is fine,
let's fail it at runtime, okay, and consume more backtraces in the future.

-- 
With Best Regards,
Andy Shevchenko