linux-kernel - Re: [PATCH v2] media: ipu-bridge: fix error code in ipu_bridge

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Date: Tue, 14 May 2024 11:14:18 +0100
From: Dan Scally <dan.scally@...asonboard.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Dan Carpenter <dan.carpenter@...aro.org>
Cc: Bingbu Cao <bingbu.cao@...el.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Hans de Goede <hdegoede@...hat.com>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] media: ipu-bridge: fix error code in ipu_bridge_init()

Hello

On 10/05/2024 16:55, Andy Shevchenko wrote:
> On Fri, May 10, 2024 at 06:43:31PM +0300, Dan Carpenter wrote:
>> Return -EINVAL if "bridge->n_sensors == 0".  Don't return success.
> LGTM, but I leave the main Q "Is it really the error case?" to the maintainers.
> I would imagine the use case where either from the following may happen:
> 1) the sensors are all new and not listed as supported;
> 2) there no sensors connected for real.
>
> In both cases I don't see this as a critical error that we can't enumerate
> the bridge itself.
>
I have no strong feelings on this really. The CIO2 driver, before the bridge was a thing, didn't 
treat a lack of connected endpoints as an error case and still completed probe if the 
cio2_parse_firmware() function doesn't find any connected endpoints...but perhaps it should have 
behaved this way all along. Is there value in having the cio2 device probed, but useless? I can't 
think of any at the moment.


The patch contents themselves look good to me.