linux-kernel - Re: [PATCH v3 1/3] soundwire: qcom: add runtime pm support

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Message-ID: <80503ba6-5a84-9481-11fc-6f0c4303331b@linux.intel.com>
Date:   Wed, 20 Apr 2022 12:53:10 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        robh+dt@...nel.org, vkoul@...nel.org,
        yung-chuan.liao@...ux.intel.com, Mark Brown <broonie@...nel.org>
Cc:     devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, quic_srivasam@...cinc.com
Subject: Re: [PATCH v3 1/3] soundwire: qcom: add runtime pm support


>>> @@ -1197,12 +1224,23 @@ static int qcom_swrm_get_port_config(struct qcom_swrm_ctrl *ctrl)
>>>   static int swrm_reg_show(struct seq_file *s_file, void *data)
>>>   {
>>>       struct qcom_swrm_ctrl *swrm = s_file->private;
>>> -    int reg, reg_val;
>>> +    int reg, reg_val, ret;
>>> +
>>> +    ret = pm_runtime_get_sync(swrm->dev);
>>> +    if (ret < 0 && ret != -EACCES) {
>>> +        dev_err_ratelimited(swrm->dev,
>>> +                    "pm_runtime_get_sync failed in %s, ret %d\n",
>>> +                    __func__, ret);
>>> +        pm_runtime_put_noidle(swrm->dev);
>> ... here it's missing?
>>
>> I have a fix ready but thought I would check first if this was intentional
> 
> Its not intentional.
> 
> 
>>
>> https://github.com/thesofproject/linux/pull/3602/commits/6353eec8dc971c5f0fda0166ae1777f71784ea32
> 
> Fix looks good.

Thanks Srini, I'll add Fixes tags and share on alsa-devel.

I guess we need to thank Mark Brown for his guidance to use pm_runtime_resume_and_get(), that's how I saw those two cases :-)