linux-kernel - Re: [PATCH 05/13] input: convert sun4i-ts to use devm_thermal_zone_of_sensor

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Date:	Thu, 10 Mar 2016 14:19:49 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>,
	Eduardo Valentin <edubezval@...il.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,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Heiko Stuebner <heiko@...ech.de>, Jens Thiele <karme@...me.de>,
	linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 05/13] input: convert sun4i-ts to use
 devm_thermal_zone_of_sensor_register

Hi,

On 10-03-16 10:34, Sascha Hauer wrote:
> On Wed, Mar 09, 2016 at 01:35:27PM -0800, 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: Dmitry Torokhov <dmitry.torokhov@...il.com>
>> Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
>> Cc: Chen-Yu Tsai <wens@...e.org>
>> Cc: Hans de Goede <hdegoede@...hat.com>
>> Cc: Zhang Rui <rui.zhang@...el.com>
>> Cc: Lukasz Majewski <l.majewski@...sung.com>
>> Cc: Heiko Stuebner <heiko@...ech.de>
>> Cc: Sascha Hauer <s.hauer@...gutronix.de>
>> Cc: Jens Thiele <karme@...me.de>
>> Cc: linux-input@...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/input/touchscreen/sun4i-ts.c | 9 +--------
>>   1 file changed, 1 insertion(+), 8 deletions(-)
>>
>> diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
>> index 4857943..d07dd29 100644
>> --- a/drivers/input/touchscreen/sun4i-ts.c
>> +++ b/drivers/input/touchscreen/sun4i-ts.c
>> @@ -115,7 +115,6 @@
>>   struct sun4i_ts_data {
>>   	struct device *dev;
>>   	struct input_dev *input;
>> -	struct thermal_zone_device *tz;
>>   	void __iomem *base;
>>   	unsigned int irq;
>>   	bool ignore_fifo_data;
>> @@ -366,10 +365,7 @@ static int sun4i_ts_probe(struct platform_device *pdev)
>>   	if (IS_ERR(hwmon))
>>   		return PTR_ERR(hwmon);
>>
>> -	ts->tz = thermal_zone_of_sensor_register(ts->dev, 0, ts,
>> -						 &sun4i_ts_tz_ops);
>> -	if (IS_ERR(ts->tz))
>> -		ts->tz = NULL;
>> +	devm_thermal_zone_of_sensor_register(ts->dev, 0, ts, &sun4i_ts_tz_ops);
>
> Shouldn't we check the return value? There are a few possibilities for
> thermal_zone_of_sensor_register to fail.

Note thee old code also was not checking this, it was simply continuing
without having registered a tz-sensor.

I guess we could log an error in that case, but that should be done in a
seperate follow-up patch.

The current patch looks good to me:

Acked-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans