linux-kernel - Re: [alsa-devel] [PATCH] ASoC: rt5659: Add mclk controls

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Date:	Thu, 28 Jul 2016 22:40:44 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Nicolin Chen <nicoleotsuka@...il.com>, broonie@...nel.org
Cc:	mark.rutland@....com, oder_chiou@...ltek.com,
	alsa-devel@...a-project.org, devicetree@...r.kernel.org,
	lgirdwood@...il.com, linux-kernel@...r.kernel.org,
	robh+dt@...nel.org, bardliao@...ltek.com
Subject: Re: [alsa-devel] [PATCH] ASoC: rt5659: Add mclk controls

> +	/* Check if MCLK provided */
> +	rt5659->mclk = devm_clk_get(&i2c->dev, "mclk");
> +	if (IS_ERR(rt5659->mclk)) {
> +		if (PTR_ERR(rt5659->mclk) == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;

The correct thing to do here is to check if != -ENOENT and then return
the error code. Otherwise you silently ignore errors if a clock was
specified, but there was an error requesting it.