linux-kernel - Re: [alsa-devel] [PATCH v1 3/3] ASoC: soc-core: fix platform name vs. of_node assignement

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Date:   Tue, 18 Dec 2018 18:40:40 +0100
From:   Matthias Reichl <hias@...us.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Jon Hunter <jonathanh@...dia.com>, alsa-devel@...a-project.org,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Takashi Iwai <tiwai@...e.com>, linux-kernel@...r.kernel.org,
        Marcel Ziswiler <marcel@...wiler.com>,
        linux-tegra@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH v1 3/3] ASoC: soc-core: fix platform name
 vs. of_node assignement

Hi Mark,

On Sun, Oct 21, 2018 at 12:23:01PM +0100, Mark Brown wrote:
> On Fri, Oct 19, 2018 at 11:22:46AM +0100, Jon Hunter wrote:
> 
> > Looking at snd_soc_init_platform(), it seems that the platform pointer
> > can be allocated by the machine driver and so if it is not allocated by
> > the core, then I don't think we should clear it here. Seems we need a
> > way to determine if this was allocated by the core.
> 
> Indeed, this is a bit of a mess.  We probably shouldn't be modifying the
> data that the drivers passed in, otherwise we get into trouble like
> this.   That suggests that we should copy the data, probably all of it.
> I will try to have a proper look at this next week.

did you find the time to look into this?

The downstream Raspberry Pi kernel contains a bunch of machine drivers
that are implemented in a similar way as the tegra_sgtl5000 driver
(static card and dai link structs, dai_link->platform_of_node filled
in from device tree) which are breaking in 4.20 on deferred probing.

Switching these drivers to dynamically allocated dai link structs,
like 76836fd35492 "ASoC: omap-abe-twl6040: Fix missing audio card
caused by deferred probing" would be a possibility, but if there's
some solution on the horizon that doesn't require changes to the
driver code it'd be easier to wait for that.

so long,

Hias

> > Furthermore, it seems that it is possible that there is more than one
> > link that might be to be cleared.
> 
> Yes, that's an issue as well.

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