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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <d54e1cb6-388d-4e0e-a3a0-387ed87082ce@ti.com>
Date: Mon, 25 Aug 2025 13:29:26 -0500
From: Andrew Davis <afd@...com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>
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 8/25/25 12:04 PM, Mathieu Poirier wrote:
> 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.
> 

It should not be needed, this devm_action callback is added inside a if(dev->of_node)
block below, so this will only be called iff dev->of_node is not null.

Andrew

>> +	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
>>