linux-kernel - Re: [PATCH v3] ASoC: amd: acp: Initialize list to store acp_stream during pcm

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Message-ID: <YuKF4l68sLKkjcmQ@sirena.org.uk>
Date:   Thu, 28 Jul 2022 13:49:38 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Venkata Prasad Potturu <venkataprasad.potturu@....com>
Cc:     alsa-devel@...a-project.org, vsujithkumar.reddy@....com,
        Vijendar.Mukunda@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, ssabakar@....com,
        Ajit Kumar Pandey <AjitKumar.Pandey@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] ASoC: amd: acp: Initialize list to store acp_stream
 during pcm_open

On Thu, Jul 28, 2022 at 06:10:50PM +0530, Venkata Prasad Potturu wrote:

> @@ -104,14 +105,13 @@ static irqreturn_t i2s_irq_handler(int irq, void *data)
>  
>  	ext_intr_stat = readl(ACP_EXTERNAL_INTR_STAT(adata, rsrc->irqp_used));
>  
> -	for (i = 0; i < ACP_MAX_STREAM; i++) {
> -		stream = adata->stream[i];
> +	spin_lock_irqsave(&adata->acp_lock, flags);
> +	list_for_each_entry(stream, &adata->stream_list, list) {

If we're already in an interrupt handler here (presumably not a threaded
one) why are we using irqsave?

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