linux-kernel - Re: [PATCH 2/3] remoteproc: da8xx: Use devm action to release reserved memory

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Message-ID: <aKyXjH-3lnCYM2rG@p14s>
Date: Mon, 25 Aug 2025 11:04:12 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Andrew Davis <afd@...com>
Cc: Bjorn Andersson <andersson@...nel.org>, Hari Nagalla <hnagalla@...com>,
	Beleswar Padhi <b-padhi@...com>, linux-remoteproc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] remoteproc: da8xx: Use devm action to release
 reserved memory

On Thu, Aug 14, 2025 at 08:55:31AM -0500, Andrew Davis wrote:
> This helps prevent mistakes like freeing out of order in cleanup functions
> and forgetting to free on error paths.
> 
> Signed-off-by: Andrew Davis <afd@...com>
> ---
>  drivers/remoteproc/da8xx_remoteproc.c | 30 +++++++++++++--------------
>  1 file changed, 14 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/remoteproc/da8xx_remoteproc.c b/drivers/remoteproc/da8xx_remoteproc.c
> index 47df21bea5254..58b4f05283d92 100644
> --- a/drivers/remoteproc/da8xx_remoteproc.c
> +++ b/drivers/remoteproc/da8xx_remoteproc.c
> @@ -233,6 +233,13 @@ static int da8xx_rproc_get_internal_memories(struct platform_device *pdev,
>  	return 0;
>  }
>  
> +static void da8xx_rproc_mem_release(void *data)
> +{
> +	struct device *dev = data;
> +

The check for dev->of_node from "free_mem" is missing.  I can add it if you
agree.

> +	of_reserved_mem_device_release(dev);
> +}
> +
>  static int da8xx_rproc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -274,14 +281,13 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
>  		ret = of_reserved_mem_device_init(dev);
>  		if (ret)
>  			return dev_err_probe(dev, ret, "device does not have specific CMA pool\n");
> +		devm_add_action_or_reset(&pdev->dev, da8xx_rproc_mem_release, &pdev->dev);
>  	}
>  
>  	rproc = devm_rproc_alloc(dev, "dsp", &da8xx_rproc_ops, da8xx_fw_name,
>  				 sizeof(*drproc));
> -	if (!rproc) {
> -		ret = -ENOMEM;
> -		goto free_mem;
> -	}
> +	if (!rproc)
> +		return -ENOMEM;
>  
>  	/* error recovery is not supported at present */
>  	rproc->recovery_disabled = true;
> @@ -294,7 +300,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
>  
>  	ret = da8xx_rproc_get_internal_memories(pdev, drproc);
>  	if (ret)
> -		goto free_mem;
> +		return ret;
>  
>  	platform_set_drvdata(pdev, rproc);
>  
> @@ -304,7 +310,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
>  					rproc);
>  	if (ret) {
>  		dev_err(dev, "devm_request_threaded_irq error: %d\n", ret);
> -		goto free_mem;
> +		return ret;
>  	}
>  
>  	/*
> @@ -314,7 +320,7 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
>  	 */
>  	ret = reset_control_assert(dsp_reset);
>  	if (ret)
> -		goto free_mem;
> +		return ret;
>  
>  	drproc->chipsig = chipsig;
>  	drproc->bootreg = bootreg;
> @@ -325,22 +331,16 @@ static int da8xx_rproc_probe(struct platform_device *pdev)
>  	ret = rproc_add(rproc);
>  	if (ret) {
>  		dev_err(dev, "rproc_add failed: %d\n", ret);
> -		goto free_mem;
> +		return ret;
>  	}
>  
>  	return 0;
> -
> -free_mem:
> -	if (dev->of_node)
> -		of_reserved_mem_device_release(dev);
> -	return ret;
>  }
>  
>  static void da8xx_rproc_remove(struct platform_device *pdev)
>  {
>  	struct rproc *rproc = platform_get_drvdata(pdev);
>  	struct da8xx_rproc *drproc = rproc->priv;
> -	struct device *dev = &pdev->dev;
>  
>  	/*
>  	 * The devm subsystem might end up releasing things before
> @@ -350,8 +350,6 @@ static void da8xx_rproc_remove(struct platform_device *pdev)
>  	disable_irq(drproc->irq);
>  
>  	rproc_del(rproc);
> -	if (dev->of_node)
> -		of_reserved_mem_device_release(dev);
>  }
>  
>  static const struct of_device_id davinci_rproc_of_match[] __maybe_unused = {
> -- 
> 2.39.2
>