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

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Message-ID: <40b90933-a881-3bd8-4533-3ded023a3e95@gmail.com>
Date:   Fri, 22 Apr 2022 09:32:08 +0800
From:   Miaoqian Lin <linmq006@...il.com>
To:     Stephen Boyd <sboyd@...nel.org>, Abel Vesa <abel.vesa@....com>,
        Dong Aisheng <aisheng.dong@....com>,
        Fabio Estevam <festevam@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx: scu: Fix pm_runtime_get_sync() error checking


On 2022/4/22 9:20, Stephen Boyd wrote:
> Quoting Miaoqian Lin (2022-04-11 23:57:18)
>> 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.
> Maybe it should use pm_runtime_resume_and_get() instead?
Fair enough，I will send patch v2.
>> Fixes: 78edeb080330 ("clk: imx: scu: add runtime pm support")
>> Signed-off-by: Miaoqian Lin <linmq006@...il.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
>>