linux-kernel - Re: [PATCH 3/3] soc: qcom: apr: Add avs/audio tracking functionality

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Date:   Mon, 18 Nov 2019 22:53:25 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     srinivas.kandagatla@...aro.org, robh+dt@...nel.org,
        tsoni@...eaurora.org, agross@...nel.org, mark.rutland@....com,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        rnayak@...eaurora.org
Subject: Re: [PATCH 3/3] soc: qcom: apr: Add avs/audio tracking functionality

On Mon 18 Nov 06:28 PST 2019, Sibi Sankar wrote:
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
[..]
> +static void of_register_apr_devices(struct device *dev, const char *svc_path)
>  {
>  	struct apr *apr = dev_get_drvdata(dev);
>  	struct device_node *node;
> +	const char *service_path;
> +	int ret;
>  
>  	for_each_child_of_node(dev->of_node, node) {
>  		struct apr_device_id id = { {0} };
>  
> +		ret = of_property_read_string_index(node, "qcom,protection-domain",
> +						    1, &service_path);
> +		if (svc_path) {
> +			/* skip APR services that are PD independent */
> +			if (ret)
> +				continue;
> +
> +			/* skip APR services whose PD paths don't match */
> +			if (strcmp(service_path, svc_path))
> +				continue;
> +		} else {
> +			/* skip APR services whose PD lookups are registered*/

Missing space before */

> +			if (ret == 0)
> +				continue;
> +		}
> +
>  		if (of_property_read_u32(node, "reg", &id.svc_id))
>  			continue;
>  
> @@ -318,6 +365,37 @@ static void of_register_apr_devices(struct device *dev)
>  	}
>  }
>  
> +static int apr_remove_device(struct device *dev, void *svc_path)
> +{
> +	struct apr_device *adev = to_apr_device(dev);
> +
> +	if (svc_path) {
> +		if (!strcmp(adev->service_path, (char *)svc_path))
> +			device_unregister(&adev->dev);
> +	} else {
> +		device_unregister(&adev->dev);
> +	}
> +
> +	return 0;
> +}
> +
> +static int apr_pd_status(struct pdr_handle *pdr, struct pdr_service *pds)

Why is the pdr status function returning an int?

> +{
> +	struct apr *apr = container_of(pdr, struct apr, pdr);
> +
> +	switch (pds->state) {
> +	case SERVREG_SERVICE_STATE_UP:
> +		of_register_apr_devices(apr->dev, pds->service_path);
> +		break;
> +	case SERVREG_SERVICE_STATE_DOWN:
> +		device_for_each_child(apr->dev, pds->service_path,
> +				      apr_remove_device);
> +		break;
> +	}
> +
> +	return 0;
> +}
[..]
> @@ -343,20 +421,19 @@ static int apr_probe(struct rpmsg_device *rpdev)
>  		return -ENOMEM;
>  	}
>  	INIT_WORK(&apr->rx_work, apr_rxwq);
> +
> +	ret = pdr_handle_init(&apr->pdr, apr_pd_status);
> +	if (ret) {
> +		dev_err(dev, "Failed to init PDR handle\n");

You need to destroy apr->rxwq here as well.

> +		return ret;
> +	}
> +
>  	INIT_LIST_HEAD(&apr->rx_list);
>  	spin_lock_init(&apr->rx_lock);
>  	spin_lock_init(&apr->svcs_lock);
>  	idr_init(&apr->svcs_idr);
> -	of_register_apr_devices(dev);
> -
> -	return 0;
> -}

Regards,
Bjorn