linux-kernel - Re: [PATCH] cpufreq: kryo: Add module remove and exit

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Message-ID: <20180608042917.2t3el22xgwaezuqe@vireshk-i7>
Date:   Fri, 8 Jun 2018 09:59:17 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     ilia.lin@...il.com
Cc:     Ilia Lin <ilialin@...eaurora.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Arnd Bergmann <arnd@...db.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: kryo: Add module remove and exit

On 07-06-18, 20:58, ilia.lin@...il.com wrote:
> From: Ilia Lin <ilia.lin@...il.com>
> 
> Add device remove and module exit code to make the driver
> functioning as a loadable module.
> 
> Fixes: ac28927659be (cpufreq: kryo: allow building as a loadable module)
> Signed-off-by: Ilia Lin <ilia.lin@...il.com>
> ---
>  drivers/cpufreq/qcom-cpufreq-kryo.c | 24 +++++++++++++++++++++---
>  1 file changed, 21 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
> index d049fe4b80c4..a08de0253169 100644
> --- a/drivers/cpufreq/qcom-cpufreq-kryo.c
> +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
> @@ -71,10 +71,10 @@ static enum _msm8996_version __init qcom_cpufreq_kryo_get_msm_id(void)
>  	return version;
>  }
>  
> +struct platform_device *cpufreq_dt_pdev;

Move this and the other platform device pointer at the top of the file after the
enum declarations. They don't look nice in the middle of nowhere.

>  static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
>  {
>  	struct opp_table *opp_tables[NR_CPUS] = {0};
> -	struct platform_device *cpufreq_dt_pdev;
>  	enum _msm8996_version msm8996_version;
>  	struct nvmem_cell *speedbin_nvmem;
>  	struct device_node *np;
> @@ -115,6 +115,8 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
>  
>  	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
>  	nvmem_cell_put(speedbin_nvmem);
> +	if (IS_ERR(speedbin))
> +		return PTR_ERR(speedbin);

This doesn't look related to this patch. Should it be a different commit ?

And I just saw definition of nvmem_cell_read() and it says the returned buffer
must be freed by caller using kfree(). I dont' see you doing that. Please also
check if any other such resources are there which you forgot to free.

>  
>  	switch (msm8996_version) {
>  	case MSM8996_V3:
> @@ -162,8 +164,15 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> +static int qcom_cpufreq_kryo_remove(struct platform_device *pdev)
> +{
> +	platform_device_unregister(cpufreq_dt_pdev);
> +	return 0;
> +}
> +
>  static struct platform_driver qcom_cpufreq_kryo_driver = {
>  	.probe = qcom_cpufreq_kryo_probe,
> +	.remove = qcom_cpufreq_kryo_remove,
>  	.driver = {
>  		.name = "qcom-cpufreq-kryo",
>  	},
> @@ -174,6 +183,7 @@ static const struct of_device_id qcom_cpufreq_kryo_match_list[] __initconst = {
>  	{ .compatible = "qcom,msm8996", },
>  };
>  
> +struct platform_device *kryo_cpufreq_pdev;
>  /*
>   * Since the driver depends on smem and nvmem drivers, which may
>   * return EPROBE_DEFER, all the real activity is done in the probe,
> @@ -198,8 +208,9 @@ static int __init qcom_cpufreq_kryo_init(void)
>  	if (unlikely(ret < 0))
>  		return ret;
>  
> -	ret = PTR_ERR_OR_ZERO(platform_device_register_simple(
> -		"qcom-cpufreq-kryo", -1, NULL, 0));
> +	kryo_cpufreq_pdev = platform_device_register_simple(
> +		"qcom-cpufreq-kryo", -1, NULL, 0);
> +	ret = PTR_ERR_OR_ZERO(kryo_cpufreq_pdev);
>  	if (0 == ret)
>  		return 0;
>  
> @@ -208,5 +219,12 @@ static int __init qcom_cpufreq_kryo_init(void)
>  }
>  module_init(qcom_cpufreq_kryo_init);
>  
> +static void __init qcom_cpufreq_kryo_exit(void)
> +{
> +	platform_device_unregister(kryo_cpufreq_pdev);
> +	platform_driver_unregister(&qcom_cpufreq_kryo_driver);
> +}
> +module_exit(qcom_cpufreq_kryo_exit);
> +
>  MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
>  MODULE_LICENSE("GPL v2");

-- 
viresh