linux-kernel - Re: [PATCH V1] ASoC: fsl_ssi: refine ipg clock usage in this module

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Date:	Tue, 09 Sep 2014 10:24:00 -0500
From:	Timur Tabi <timur@...i.org>
To:	Mark Brown <broonie@...nel.org>
CC:	Shengjiu Wang <shengjiu.wang@...escale.com>,
	nicoleotsuka@...il.com, Li.Xiubo@...escale.com,
	lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.de,
	alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1] ASoC: fsl_ssi: refine ipg clock usage in this module

On 09/09/2014 10:21 AM, Mark Brown wrote:
>> if (ssi_private->clk)
>> >	clk_prepare_enable(ssi_private->clk);

> Should be a !IS_ERR() - NULL is a valid clock.

In that case, ssi_private->clk needs to be initialized to -EINVAL or 
something, so that the check works on systems that don't have any clocks.
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