linux-kernel - Re: [PATCH 04/11] ASoC: amd: add ACP3x PCM platform driver

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Date:   Tue, 13 Nov 2018 11:41:22 -0800
From:   Mark Brown <broonie@...nel.org>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>
Cc:     Alexander.Deucher@....com, Vishnuvardhanrao.Ravulapati@....com,
        Maruthi Bayyavarapu <maruthi.bayyavarapu@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Sanju R Mehta <sanju.mehta@....com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>
Subject: Re: [PATCH 04/11] ASoC: amd: add ACP3x PCM platform driver

On Mon, Nov 12, 2018 at 11:04:55AM +0530, Vijendar Mukunda wrote:

> +static struct snd_pcm_ops acp3x_dma_ops = {
> +	.open = NULL,
> +	.close = NULL,
> +	.ioctl = NULL,
> +	.hw_params = NULL,
> +	.hw_free = NULL,
> +	.pointer = NULL,
> +	.mmap = NULL,
> +};
> +
> +struct snd_soc_dai_ops acp3x_dai_i2s_ops = {
> +	.hw_params = NULL,
> +	.trigger   = NULL,
> +	.set_fmt = NULL,
> +};

Having these empty ops sets is really surprising - I see they do get
added later on, but there's no sign that this will happen here and
assigning NULL explicitly is generally bad.  It'd be better to just
leave these empty here so they don't look like a bug when doing review.

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