linux-kernel - Re: [PATCH] ASoC: Intel: boards: sof-wm8804: add check for PLL setting

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Date:   Fri, 26 Feb 2021 14:54:09 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: Intel: boards: sof-wm8804: add check for PLL
 setting



On 2/26/21 12:56 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the return from snd_soc_dai_set_pll is not checking for
> failure, this is the only driver in the kernel that ignores this,
> so it probably should be added for sake of completeness.  Fix this
> by adding an error return check.
> 
> Addresses-Coverity: ("Unchecked return value")
> Fixes: f139546fb7d4 ("ASoC: Intel: boards: sof-wm8804: support for Hifiberry Digiplus boards")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

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

> ---
>   sound/soc/intel/boards/sof_wm8804.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/intel/boards/sof_wm8804.c b/sound/soc/intel/boards/sof_wm8804.c
> index a46ba13e8eb0..6a181e45143d 100644
> --- a/sound/soc/intel/boards/sof_wm8804.c
> +++ b/sound/soc/intel/boards/sof_wm8804.c
> @@ -124,7 +124,11 @@ static int sof_wm8804_hw_params(struct snd_pcm_substream *substream,
>   	}
>   
>   	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
> -	snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
> +	ret = snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
> +	if (ret < 0) {
> +		dev_err(rtd->card->dev, "Failed to set WM8804 PLL\n");
> +		return ret;
> +	}
>   
>   	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
>   				     sysclk, SND_SOC_CLOCK_OUT);
>