linux-kernel - Re: [PATCH 7/8] ASoC: topology: suppress probe deferral errors

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Message-ID: <f464d5b1-c708-4b3f-f1d1-031c5def5b38@linux.intel.com>
Date:   Thu, 6 Jul 2023 09:25:26 +0200
From:   Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Mark Brown <broonie@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Alex Elder <elder@...aro.org>
Subject: Re: [PATCH 7/8] ASoC: topology: suppress probe deferral errors

On 7/6/2023 8:14 AM, Johan Hovold wrote:
> On Wed, Jul 05, 2023 at 05:07:22PM +0200, Amadeusz Sławiński wrote:
>> On 7/5/2023 2:30 PM, Johan Hovold wrote:
>>> Suppress probe deferral error messages when loading topologies and
>>> creating frontend links to avoid spamming the logs when a component has
>>> not yet been registered:
>>>
>>>       snd-sc8280xp sound: ASoC: adding FE link failed
>>>       snd-sc8280xp sound: ASoC: topology: could not load header: -517
>>>
>>> Note that dev_err_probe() is not used as the topology component can be
>>> probed and removed while the underlying platform device remains bound to
>>> its driver.
>>
>> I'm not sure that I understand that argument... what's wrong with
>> dev_err_probe(tplg->dev, err, "ASoC: adding FE link failed\n");
>> instead of
>> dev_err(tplg->dev, "ASoC: adding FE link failed\n");
>> ?
> 
> In short, it is not correct to use dev_err_probe() here as this is not a
> probe function.
> 
> dev_err_probe() is tied to driver core and will specifically allocate
> and associate an error message with the struct device on probe
> deferrals, which is later freed when the struct device is bound to a
> driver (or released).
> 

I guess you mean call to: device_set_deferred_probe_reason(dev, &vaf);
perhaps functionality could be extended to allow to skip this call and 
just do prints? Or just add separate dev_err_defer function without this 
step, although it would be best if they could share parts of code.