linux-kernel - Re: [PATCH v6 02/17] media: v4l2: async: Allow searching for asd of any type

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Date:   Tue, 25 Sep 2018 18:05:36 -0700
From:   Steve Longerbeam <steve_longerbeam@...tor.com>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
CC:     Steve Longerbeam <slongerbeam@...il.com>,
        <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sebastian Reichel <sre@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 02/17] media: v4l2: async: Allow searching for asd of
 any type



On 09/25/2018 03:20 PM, Mauro Carvalho Chehab wrote:
> Em Tue, 25 Sep 2018 14:04:21 -0700
> Steve Longerbeam <steve_longerbeam@...tor.com> escreveu:
>
>>>   
>>>> @@ -392,12 +406,11 @@ static int __v4l2_async_notifier_register(struct v4l2_async_notifier *notifier)
>>>>    		case V4L2_ASYNC_MATCH_CUSTOM:
>>>>    		case V4L2_ASYNC_MATCH_DEVNAME:
>>>>    		case V4L2_ASYNC_MATCH_I2C:
>>>> -			break;
>>>>    		case V4L2_ASYNC_MATCH_FWNODE:
>>>> -			if (v4l2_async_notifier_fwnode_has_async_subdev(
>>>> -				    notifier, asd->match.fwnode, i)) {
>>>> +			if (v4l2_async_notifier_has_async_subdev(
>>>> +				    notifier, asd, i)) {
>>>>    				dev_err(dev,
>>>> -					"fwnode has already been registered or in notifier's subdev list\n");
>>>> +					"asd has already been registered or in notifier's subdev list\n");
>>> Please, never use "asd" on messages printed to the user. While someone
>>> may understand it while reading the source code, for a poor use,
>>> "asd" is just a random sequence of 3 characters.
>> I will change the message to read:
>>
>> "subdev descriptor already listed in this or other notifiers".
> Perfect!

But the error message is removed in the subsequent patch
"[PATCH 03/17] media: v4l2: async: Add v4l2_async_notifier_add_subdev".

I could bring it back as a dev_dbg() in v4l2_async_notifier_asd_valid(), but
this shouldn't be a dev_err() anymore since it is up to the media platform
to decide whether an already existing subdev descriptor is an error.

Steve