linux-kernel - Re: [PATCH] ASoC: ti: Fix runtime PM imbalance in omap2_mcbsp_set_clks

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Message-ID: <16f653b3-2a36-7b2c-60be-73d550e47774@ti.com>
Date:   Mon, 25 May 2020 11:37:30 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, <kjlu@....edu>
CC:     Jarkko Nikula <jarkko.nikula@...mer.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: ti: Fix runtime PM imbalance in
 omap2_mcbsp_set_clks_src



On 25/05/2020 10.22, Dinghao Liu wrote:
> When clk_set_parent() returns an error code, a pairing
> runtime PM usage counter increment is needed to keep the
> counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  sound/soc/ti/omap-mcbsp.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/sound/soc/ti/omap-mcbsp.c b/sound/soc/ti/omap-mcbsp.c
> index 3d41ca2238d4..84b4de9b670c 100644
> --- a/sound/soc/ti/omap-mcbsp.c
> +++ b/sound/soc/ti/omap-mcbsp.c
> @@ -80,6 +80,7 @@ static int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id)
>  	if (r) {
>  		dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n",
>  			src);
> +		pm_runtime_get_sync(mcbsp->dev);

>  		clk_put(fck_src);
>  		return r;
>  	}

I think it would be cleaner in this way:

pm_runtime_put_sync(mcbsp->dev);

r = clk_set_parent(mcbsp->fclk, fck_src);
if (r)
	dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n",
		src);

pm_runtime_get_sync(mcbsp->dev);
clk_put(fck_src);

return r;

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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