linux-kernel - Re: [PATCH] clk: imx: scu: Fix pm_runtime_get

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Date:   Mon, 18 Apr 2022 14:54:34 +0300
From:   Abel Vesa <abel.vesa@....com>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Dong Aisheng <aisheng.dong@....com>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx: scu: Fix pm_runtime_get_sync() error checking

On 22-04-12 06:57:18, Miaoqian Lin wrote:
> If the device is already in a runtime PM enabled state
> pm_runtime_get_sync() will return 1, so a test for negative
> value should be used to check for errors.
>
> Fixes: 78edeb080330 ("clk: imx: scu: add runtime pm support")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Reviewed-by: Abel Vesa <abel.vesa@....com>

> ---
>  drivers/clk/imx/clk-scu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
> index 083da31dc3ea..18c6190eeffd 100644
> --- a/drivers/clk/imx/clk-scu.c
> +++ b/drivers/clk/imx/clk-scu.c
> @@ -529,7 +529,7 @@ static int imx_clk_scu_probe(struct platform_device *pdev)
>  		pm_runtime_enable(dev);
>
>  		ret = pm_runtime_get_sync(dev);
> -		if (ret) {
> +		if (ret < 0) {
>  			pm_genpd_remove_device(dev);
>  			pm_runtime_disable(dev);
>  			return ret;
> --
> 2.17.1
>