linux-kernel - Re: [alsa-devel] [PATCH] ASoC: Intel: bytcr_rt565: fix missing assignment to ret

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Date:   Wed, 2 May 2018 10:20:26 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] ASoC: Intel: bytcr_rt565: fix missing
 assignment to ret_val

On 5/2/18 9:29 AM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently, the check that ret_val is not -ENOENT is always true and
> the quirk bit BYT_RY5651_MCLK_EN is never being cleared because ret_val
> is always zero at this point from a previous assignment earlier on.
> I believe that ret_val should actually be assigned to the return from
> devm_clk_get() as this can return -ENOENT (from a deeper call to
> clk_get_sys) and that was the original intention to check this.
> 
> Detected by CoverityScan, CID#1460228 ("Logically dead code")

nice catch, the fix is consistent with what is done for rt5640.

Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

> 
> Fixes: 02c0a3b3047f ("ASoC: Intel: bytcr_rt5651: add MCLK, quirks and cleanups")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   sound/soc/intel/boards/bytcr_rt5651.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/intel/boards/bytcr_rt5651.c b/sound/soc/intel/boards/bytcr_rt5651.c
> index 3c7d93520c52..469e2695d121 100644
> --- a/sound/soc/intel/boards/bytcr_rt5651.c
> +++ b/sound/soc/intel/boards/bytcr_rt5651.c
> @@ -856,9 +856,10 @@ static int snd_byt_rt5651_mc_probe(struct platform_device *pdev)
>   	if (byt_rt5651_quirk & BYT_RT5651_MCLK_EN) {
>   		priv->mclk = devm_clk_get(&pdev->dev, "pmc_plt_clk_3");
>   		if (IS_ERR(priv->mclk)) {
> +			ret_val = PTR_ERR(priv->mclk);
>   			dev_err(&pdev->dev,
> -				"Failed to get MCLK from pmc_plt_clk_3: %ld\n",
> -				PTR_ERR(priv->mclk));
> +				"Failed to get MCLK from pmc_plt_clk_3: %d\n",
> +				ret_val);
>   			/*
>   			 * Fall back to bit clock usage for -ENOENT (clock not
>   			 * available likely due to missing dependencies), bail
>