Re: [PATCH v3 03/14] ASoC: SOF: Add driver debug support.

[Mark Brown <broonie@kernel.org>]

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On Tue, Dec 11, 2018 at 03:23:07PM -0600, Pierre-Louis Bossart wrote:

> +	/* copy from DSP MMIO */
> +	pm_runtime_get_noresume(sdev->dev);

Why are we doing a _get_noresume() here?  It won't actually do anything
to the device...

> +
> +	memcpy_fromio(buf,  dfse->buf + pos, size);

Extra space?

> +	/*
> +	 * TODO: revisit to check if we need mark_last_busy, or if we
> +	 * should change to use xxx_put_sync[_suspend]().
> +	 */
> +	ret = pm_runtime_put_sync_autosuspend(sdev->dev);
> +	if (ret < 0)
> +		dev_warn(sdev->dev, "warn: debugFS failed to autosuspend %zd\n",
> +			 ret);

It rather depends what you're doing...  I'm definitely confused as to
why you need a _sync operation - if you're doing autosuspend stuff
presumably you don't care so much if the device gets powered down
immediately, and I can't in general see why that'd be important.

> +	dfse->dfsentry = debugfs_create_file(name, 0444, sdev->debugfs_root,
> +					     dfse, &sof_dfs_fops);
> +	if (!dfse->dfsentry) {
> +		dev_err(sdev->dev, "error: cannot create debugfs entry.\n");
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(snd_sof_debugfs_io_create_item);

debugfs uses EXPORT_SYMBOL_GPL().

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