linux-kernel - Re: [PATCH 6/9] remoteproc: qcom_q6v5_wcss: Use devm_rproc

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

Date: Fri, 2 Feb 2024 15:14:20 -0600
From: Andrew Davis <afd@...com>
To: Unnathi Chalicheemala <quic_uchalich@...cinc.com>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Shawn
 Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix
 Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP
 Linux Team <linux-imx@....com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC: <linux-remoteproc@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 6/9] remoteproc: qcom_q6v5_wcss: Use devm_rproc_alloc()
 helper

On 2/2/24 2:51 PM, Unnathi Chalicheemala wrote:
> 
> 
> On 1/23/2024 10:46 AM, Andrew Davis wrote:
>> Use the device lifecycle managed allocation function. 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/qcom_q6v5_wcss.c | 24 +++++++++---------------
>>   1 file changed, 9 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c b/drivers/remoteproc/qcom_q6v5_wcss.c
>> index cff1fa07d1def..94f68c919ee62 100644
>> --- a/drivers/remoteproc/qcom_q6v5_wcss.c
>> +++ b/drivers/remoteproc/qcom_q6v5_wcss.c
>> @@ -1011,8 +1011,8 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
>>   	if (!desc)
>>   		return -EINVAL;
>>   
>> -	rproc = rproc_alloc(&pdev->dev, pdev->name, desc->ops,
>> -			    desc->firmware_name, sizeof(*wcss));
>> +	rproc = devm_rproc_alloc(&pdev->dev, pdev->name, desc->ops,
>> +				 desc->firmware_name, sizeof(*wcss));
>>   	if (!rproc) {
>>   		dev_err(&pdev->dev, "failed to allocate rproc\n");
>>   		return -ENOMEM;
>> @@ -1027,29 +1027,29 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
>>   
>>   	ret = q6v5_wcss_init_mmio(wcss, pdev);
>>   	if (ret)
>> -		goto free_rproc;
>> +		return ret;
>>   
>>   	ret = q6v5_alloc_memory_region(wcss);
>>   	if (ret)
>> -		goto free_rproc;
>> +		return ret;
>>   
>>   	if (wcss->version == WCSS_QCS404) {
>>   		ret = q6v5_wcss_init_clock(wcss);
>>   		if (ret)
>> -			goto free_rproc;
>> +			return ret;
>>   
>>   		ret = q6v5_wcss_init_regulator(wcss);
>>   		if (ret)
>> -			goto free_rproc;
>> +			return ret;
>>   	}
>>   
>>   	ret = q6v5_wcss_init_reset(wcss, desc);
>>   	if (ret)
>> -		goto free_rproc;
>> +		return ret;
>>   
>>   	ret = qcom_q6v5_init(&wcss->q6v5, pdev, rproc, desc->crash_reason_smem, NULL, NULL);
>>   	if (ret)
>> -		goto free_rproc;
>> +		return ret;
>>   
>>   	qcom_add_glink_subdev(rproc, &wcss->glink_subdev, "q6wcss");
>>   	qcom_add_ssr_subdev(rproc, &wcss->ssr_subdev, "q6wcss");
>> @@ -1061,16 +1061,11 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
>>   
>>   	ret = rproc_add(rproc);
>>   	if (ret)
>> -		goto free_rproc;
>> +		return ret;
>>   
>>   	platform_set_drvdata(pdev, rproc);
>>   
>>   	return 0;
>> -
>> -free_rproc:
>> -	rproc_free(rproc);
>> -
>> -	return ret;
> 
> This return statement should stay, right?
> 

No path goes to "free_rproc" anymore, so we always do the "return 0;"
above on non-error paths.

Andrew

>>   }
>>   
>>   static void q6v5_wcss_remove(struct platform_device *pdev)
>> @@ -1080,7 +1075,6 @@ static void q6v5_wcss_remove(struct platform_device *pdev)
>>   
>>   	qcom_q6v5_deinit(&wcss->q6v5);
>>   	rproc_del(rproc);
>> -	rproc_free(rproc);
>>   }
>>   
>>   static const struct wcss_data wcss_ipq8074_res_init = {