linux-kernel - Re: [RFC PATCH 1/2] ASoC: core: Print one-time messages if missing resources when binding DAIs

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Message-ID: <31474093-6389-629a-73f0-d60cc8d15d3c@osg.samsung.com>
Date:   Mon, 24 Oct 2016 15:39:00 -0300
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
        alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [RFC PATCH 1/2] ASoC: core: Print one-time messages if missing
 resources when binding DAIs

Hello Mark,

On 10/24/2016 02:21 PM, Mark Brown wrote:
> On Wed, Oct 19, 2016 at 02:21:05PM -0300, Javier Martinez Canillas wrote:
>> If snd_soc_find_dai() doesn't find a DAI in soc_bind_dai_link(), a
>> error message is printed and an -EPROBE_DEFER errno code returned to
>> the caller.
> 
>> But since many probe retries can happen before a resource is available,
>> the printed messages can spam the kernel log buffer and slow the boot.
> 
>> The information is useful to know that a dependency was not meet and a
>> defer happened, but isn't necessary to print it on each probe deferral.
> 
> This then turns any subsequent failure into a silent one which isn't
> great for diagnostics.  It'd be better to look into trying to avoid the
> retries in the first place, Raphael's dependency graph stuff looks very
> promising here.
>

Ok, thanks for your feedback. I'll also investigate why the number of
probes/retries increased that much from v4.8.

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America