linux-kernel - Re: [PATCH 11/13] thermal: convert exynos to use devm_thermal_zone_of_sensor

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Date:	Mon, 14 Mar 2016 12:48:12 -0700
From:	Eduardo Valentin <edubezval@...il.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Rui Zhang <rui.zhang@...el.com>,
	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, lm-sensors@...sensors.org,
	Lukasz Majewski <l.majewski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 11/13] thermal: convert exynos to use
 devm_thermal_zone_of_sensor_register

On Thu, Mar 10, 2016 at 09:16:36AM +0900, Krzysztof Kozlowski wrote:
> On 10.03.2016 06:35, Eduardo Valentin wrote:
> > This changes the driver to use the devm_ version
> > of thermal_zone_of_sensor_register and cleans
> > up the  local points and unregister calls.
> > 
> > Cc: Lukasz Majewski <l.majewski@...sung.com>
> > Cc: Zhang Rui <rui.zhang@...el.com>
> > Cc: Kukjin Kim <kgene@...nel.org>
> > Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > Cc: linux-pm@...r.kernel.org
> > Cc: linux-samsung-soc@...r.kernel.org
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org
> > Signed-off-by: Eduardo Valentin <edubezval@...il.com>
> > ---
> >  drivers/thermal/samsung/exynos_tmu.c | 12 ++++--------
> >  1 file changed, 4 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> > index fa61eff..256039e 100644
> > --- a/drivers/thermal/samsung/exynos_tmu.c
> > +++ b/drivers/thermal/samsung/exynos_tmu.c
> > @@ -1363,8 +1363,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> >  	 * data->tzd must be registered before calling exynos_tmu_initialize(),
> >  	 * requesting irq and calling exynos_tmu_control().
> >  	 */
> > -	data->tzd = thermal_zone_of_sensor_register(&pdev->dev, 0, data,
> > -						    &exynos_sensor_ops);
> > +	data->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, data,
> > +							 &exynos_sensor_ops);
> >  	if (IS_ERR(data->tzd)) {
> >  		ret = PTR_ERR(data->tzd);
> >  		dev_err(&pdev->dev, "Failed to register sensor: %d\n", ret);
> > @@ -1374,21 +1374,19 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> >  	ret = exynos_tmu_initialize(pdev);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "Failed to initialize TMU\n");
> > -		goto err_thermal;
> > +		goto err_sclk;
> >  	}
> >  
> >  	ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
> >  		IRQF_TRIGGER_RISING | IRQF_SHARED, dev_name(&pdev->dev), data);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
> > -		goto err_thermal;
> > +		goto err_sclk;
> >  	}
> >  
> >  	exynos_tmu_control(pdev, true);
> >  	return 0;
> >  
> > -err_thermal:
> > -	thermal_zone_of_sensor_unregister(&pdev->dev, data->tzd);
> >  err_sclk:
> >  	clk_disable_unprepare(data->sclk);
> >  err_clk:
> > @@ -1406,9 +1404,7 @@ err_sensor:
> >  static int exynos_tmu_remove(struct platform_device *pdev)
> >  {
> >  	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> > -	struct thermal_zone_device *tzd = data->tzd;
> >  
> > -	thermal_zone_of_sensor_unregister(&pdev->dev, tzd);
> 
> Before, the sensor was removed from zone (ops like get_temp NULL-ified
> etc), then we stopped TMU, disabled clocks, disabled regulator and
> finally freed IRQ (through devm-like interface).
> 
> Now this will be different - first stop of TMU, disable clocks, disable,
> regulator, remove sensor from zone (through devm) and finally free IRQ.
> 
> Are you sure that changing order is okay?

Not really. After checking the driver code and your suggestions, I don't
think this driver would benefit of this change, not at least the way it
is currently.

Thanks for pointing out. I am taking this driver out of the series.


> 
> Best regards,
> Krzysztof
> 
> >  	exynos_tmu_control(pdev, false);
> >  
> >  	clk_disable_unprepare(data->sclk);
> > 
>