linux-kernel - Re: [PATCH V5 1/2] soc: qcom: aoss: Expose send for generic usecase

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Date:   Mon, 9 Aug 2021 15:27:26 +0530
From:   Deepak Kumar Singh <deesin@...eaurora.org>
To:     Stephen Boyd <swboyd@...omium.org>, bjorn.andersson@...aro.org,
        clew@...eaurora.org, sibis@...eaurora.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, Andy Gross <agross@...nel.org>
Subject: Re: [PATCH V5 1/2] soc: qcom: aoss: Expose send for generic usecase


On 8/6/2021 12:04 AM, Stephen Boyd wrote:
> Quoting Deepak Kumar Singh (2021-08-05 04:12:53)
>> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
>> index 934fcc4..b84cb31 100644
>> --- a/drivers/soc/qcom/qcom_aoss.c
>> +++ b/drivers/soc/qcom/qcom_aoss.c
>> @@ -515,6 +521,43 @@ static void qmp_cooling_devices_remove(struct qmp *qmp)
>>                  thermal_cooling_device_unregister(qmp->cooling_devs[i].cdev);
>>   }
>>
>> +/**
>> + * qmp_get() - get a qmp handle from a device
>> + * @dev: client device pointer
>> + *
>> + * Return: handle to qmp device on success, ERR_PTR() on failure
>> + */
>> +struct qmp *qmp_get(struct device *dev)
>> +{
>> +       struct platform_device *pdev;
>> +       struct device_node *np;
>> +       struct qmp *qmp;
>> +
>> +       if (!dev || !dev->of_node)
>> +               return ERR_PTR(-EINVAL);
>> +
>> +       np = of_parse_phandle(dev->of_node, "qcom,qmp", 0);
>> +       if (!np)
>> +               return ERR_PTR(-ENODEV);
>> +
>> +       pdev = of_find_device_by_node(np);
>> +       of_node_put(np);
>> +       if (!pdev)
>> +               return ERR_PTR(-EINVAL);
>> +
>> +       qmp = platform_get_drvdata(pdev);
>> +
>> +       return qmp ? qmp : ERR_PTR(-EPROBE_DEFER);
>> +}
>> +EXPORT_SYMBOL(qmp_get);
>> +
>> +void qmp_put(struct qmp *qmp)
>> +{
>> +       if (!IS_ERR_OR_NULL(qmp))
>> +               put_device(qmp->dev);
> Where is the corresponding get_device() call?
of_find_device_by_node() internally calls get_device(), so no need to 
call get_device() explicitly.
>
>> +}
>> +EXPORT_SYMBOL(qmp_put);
>> +
>>   static int qmp_probe(struct platform_device *pdev)
>>   {
>>          struct resource *res;