linux-kernel - Re: [PATCH 1/2] thermal: qoriq: Use devm_add_action_or

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Message-ID: <831cd71d-04dc-834f-fa28-6091a186dce3@linaro.org>
Date:   Thu, 12 Mar 2020 12:56:39 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Anson Huang <anson.huang@....com>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "amit.kucheria@...durent.com" <amit.kucheria@...durent.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 1/2] thermal: qoriq: Use devm_add_action_or_reset() to
 handle all cleanups

On 12/03/2020 12:47, Anson Huang wrote:
> Hi, Daniel
> 
>> Subject: Re: [PATCH 1/2] thermal: qoriq: Use devm_add_action_or_reset() to
>> handle all cleanups
>>
>> On 11/03/2020 06:07, Anson Huang wrote:
>>> Use devm_add_action_or_reset() to handle all cleanups of failure in
>>> .probe and .remove, then .remove callback can be dropped.
>>
>> Is this change compatible with the tristate?
> 
> I think so, any concern need me to double confirm?

TBH, I discovered the function with your patch. My concern is if the
callback is called when unloading the module.


>>> Signed-off-by: Anson Huang <Anson.Huang@....com>
>>> ---
>>>  drivers/thermal/qoriq_thermal.c | 35
>>> ++++++++++++++---------------------
>>>  1 file changed, 14 insertions(+), 21 deletions(-)
>>>
>>> diff --git a/drivers/thermal/qoriq_thermal.c
>>> b/drivers/thermal/qoriq_thermal.c index 874bc46..67a8d84 100644
>>> --- a/drivers/thermal/qoriq_thermal.c
>>> +++ b/drivers/thermal/qoriq_thermal.c
>>> @@ -228,6 +228,14 @@ static const struct regmap_access_table
>> qoriq_rd_table = {
>>>  	.n_yes_ranges	= ARRAY_SIZE(qoriq_yes_ranges),
>>>  };
>>>
>>> +static void qoriq_tmu_action(void *p) {
>>> +	struct qoriq_tmu_data *data = p;
>>> +
>>> +	regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
>>> +	clk_disable_unprepare(data->clk);
>>> +}
>>> +
>>>  static int qoriq_tmu_probe(struct platform_device *pdev)  {
>>>  	int ret;
>>> @@ -278,6 +286,10 @@ static int qoriq_tmu_probe(struct platform_device
>> *pdev)
>>>  		return ret;
>>>  	}
>>>
>>> +	ret = devm_add_action_or_reset(dev, qoriq_tmu_action, data);
>>> +	if (ret)
>>> +		return ret;
>>> +
>>>  	/* version register offset at: 0xbf8 on both v1 and v2 */
>>>  	ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver);
>>>  	if (ret) {
>>> @@ -290,35 +302,17 @@ static int qoriq_tmu_probe(struct
>>> platform_device *pdev)
>>>
>>>  	ret = qoriq_tmu_calibration(dev, data);	/* TMU calibration */
>>>  	if (ret < 0)
>>> -		goto err;
>>> +		return ret;
>>>
>>>  	ret = qoriq_tmu_register_tmu_zone(dev, data);
>>>  	if (ret < 0) {
>>>  		dev_err(dev, "Failed to register sensors\n");
>>> -		ret = -ENODEV;
>>> -		goto err;
>>> +		return ret;
>>>  	}
>>>
>>>  	platform_set_drvdata(pdev, data);
>>>
>>>  	return 0;
>>> -
>>> -err:
>>> -	clk_disable_unprepare(data->clk);
>>> -
>>> -	return ret;
>>> -}
>>> -
>>> -static int qoriq_tmu_remove(struct platform_device *pdev) -{
>>> -	struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
>>> -
>>> -	/* Disable monitoring */
>>> -	regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
>>> -
>>> -	clk_disable_unprepare(data->clk);
>>> -
>>> -	return 0;
>>>  }
>>>
>>>  static int __maybe_unused qoriq_tmu_suspend(struct device *dev) @@
>>> -365,7 +359,6 @@ static struct platform_driver qoriq_tmu = {
>>>  		.of_match_table	= qoriq_tmu_match,
>>>  	},
>>>  	.probe	= qoriq_tmu_probe,
>>> -	.remove	= qoriq_tmu_remove,
>>>  };
>>>  module_platform_driver(qoriq_tmu);
>>>
>>>
>>
>>
>> --
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