linux-kernel - Re: [PATCH v4 2/8] i2c: add I2C Address Translator (ATR) support

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Date:   Fri, 4 Nov 2022 19:27:17 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     devicetree@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Mark Rutland <mark.rutland@....com>,
        Matti Vaittinen <Matti.Vaittinen@...rohmeurope.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Peter Rosin <peda@...ntia.se>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        satish.nagireddy@...cruise.com
Subject: Re: [PATCH v4 2/8] i2c: add I2C Address Translator (ATR) support

On Fri, Nov 04, 2022 at 05:26:24PM +0200, Tomi Valkeinen wrote:
> On 04/11/2022 14:38, Andy Shevchenko wrote:
> > On Fri, Nov 04, 2022 at 01:59:06PM +0200, Tomi Valkeinen wrote:
> > > On 01/11/2022 16:30, Andy Shevchenko wrote:
> > > > On Tue, Nov 01, 2022 at 03:20:26PM +0200, Tomi Valkeinen wrote:

...

> > > > > +	WARN(sysfs_create_link(&chan->adap.dev.kobj, &dev->kobj, "atr_device"),
> > > > > +	     "can't create symlink to atr device\n");
> > > > > +	WARN(sysfs_create_link(&dev->kobj, &chan->adap.dev.kobj, symlink_name),
> > > > > +	     "can't create symlink for channel %u\n", chan_id);
> > > > 
> > > > Why WARNs? sysfs has already some in their implementation.
> > > 
> > > True, and I can drop these if required. But afaics, sysfs_create_link only
> > > warns if there's a duplicate entry, not for other errors.
> > 
> > The problem with WARN that it can be easily converted to real Oops. Do you
> > consider other errors are so fatal that machine would need a reboot?
> 
> Yes, WARNs are bad, especially as the error here is not critical. I'll
> change these to dev_warn(). (also, I didn't know WARN could be made to
> oops).

panic_on_warn

-- 
With Best Regards,
Andy Shevchenko