linux-kernel - Re: [PATCH V6 8/8] soundwire: amd: add pm

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Date:   Tue, 7 Mar 2023 09:28:21 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vijendar Mukunda <Vijendar.Mukunda@....com>, vkoul@...nel.org
Cc:     alsa-devel@...a-project.org, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, Mario.Limonciello@....com,
        amadeuszx.slawinski@...ux.intel.com, Mastan.Katragadda@....com,
        Arungopal.kondaveeti@....com, claudiu.beznea@...rochip.com,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V6 8/8] soundwire: amd: add pm_prepare callback and pm ops
 support


> +static int amd_resume_child_device(struct device *dev, void *data)
> +{
> +	struct sdw_slave *slave = dev_to_sdw_dev(dev);
> +	int ret;
> +
> +	if (!slave->probed) {
> +		dev_dbg(dev, "skipping device, no probed driver\n");
> +		return 0;
> +	}
> +	if (!slave->dev_num_sticky) {
> +		dev_dbg(dev, "skipping device, never detected on bus\n");
> +		return 0;
> +	}
> +	if (!pm_runtime_suspended(dev))
> +		return 0;
> +	ret = pm_request_resume(dev);

I still don't get why the test above was needed. It's racy and brings
limited benefits.

> +	if (ret < 0)
> +		dev_err(dev, "pm_request_resume failed: %d\n", ret);
> +
> +	return ret;
> +}