linux-kernel - Re: [PATCH V5 4/4] ASoC: fsl_asrc: Fix error with S24

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Message-ID: <20190926014905.GA24545@Asurada-Nvidia.nvidia.com>
Date:   Wed, 25 Sep 2019 18:49:06 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     timur@...nel.org, Xiubo.Lee@...il.com, festevam@...il.com,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, lars@...afoo.de
Subject: Re: [PATCH V5 4/4] ASoC: fsl_asrc: Fix error with S24_3LE format
 bitstream in i.MX8

Just a small concern...

On Thu, Sep 26, 2019 at 09:29:51AM +0800, Shengjiu Wang wrote:
>  static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
>  {
> +
> +	release_pair = false;
> +	ret = snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);

This set_runtime_hwparams() always returns 0 for now, but if
one day it changes and it fails here, kfree() will be still
ignored although the startup() gets error-out.

We could avoid this if we continue to ignore the return value
like the current code. Or we may check ret at kfree() also?

> +
> +out:
> +	dma_release_channel(tmp_chan);
> +
> +dma_chan_err:
> +	fsl_asrc_release_pair(pair);
> +
> +req_pair_err:
> +	if (release_pair)
> +		kfree(pair);
> +
> +	return ret;
>  }