Re: [PATCH V6 8/8] soundwire: amd: add pm_prepare callback and pm ops support

[Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>]

> +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;
> +}