linux-kernel - Re: [PATCH 4/5] leds: flash: Add devm

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Date:   Tue, 1 Oct 2019 23:10:01 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, pavel@....cz
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] leds: flash: Add devm_* functions to the flash class

Moreover, checkpatch.pl complains about whitespaces
in two places of this patch.

On 10/1/19 11:06 PM, Jacek Anaszewski wrote:
> Dan,
> 
> Thank you for the patch. One funny omission caught my
> eye here and in led-class.c when making visual comparison.
> Please refer below.
> 
> On 10/1/19 8:04 PM, Dan Murphy wrote:
>> Add the missing device managed API for registration and
>> unregistration for the LED flash class.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>  drivers/leds/led-class-flash.c  | 50 +++++++++++++++++++++++++++++++++
>>  include/linux/led-class-flash.h | 14 +++++++++
>>  2 files changed, 64 insertions(+)
>>
>> diff --git a/drivers/leds/led-class-flash.c b/drivers/leds/led-class-flash.c
>> index 60c3de5c6b9f..c2b4fd02a1bc 100644
>> --- a/drivers/leds/led-class-flash.c
>> +++ b/drivers/leds/led-class-flash.c
>> @@ -327,6 +327,56 @@ void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev)
>>  }
>>  EXPORT_SYMBOL_GPL(led_classdev_flash_unregister);
>>  
>> +static void devm_led_classdev_flash_release(struct device *dev, void *res)
>> +{
>> +	led_classdev_flash_unregister(*(struct led_classdev_flash **)res);
>> +}
>> +
>> +int devm_led_classdev_flash_register_ext(struct device *parent,
>> +				     struct led_classdev_flash *fled_cdev,
>> +				     struct led_init_data *init_data)
>> +{
>> +	struct led_classdev_flash **dr;
>> +	int ret;
>> +
>> +	dr = devres_alloc(devm_led_classdev_flash_release, sizeof(*dr),
>> +			  GFP_KERNEL);
>> +	if (!dr)
>> +		return -ENOMEM;
>> +
>> +	ret = led_classdev_flash_register_ext(parent, fled_cdev, init_data);
>> +	if (ret) {
>> +		devres_free(dr);
>> +		return ret;
>> +	}
>> +
>> +	*dr = fled_cdev;
>> +	devres_add(parent, dr);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devm_led_classdev_flash_register_ext);
>> +
>> +static int devm_led_classdev_flash_match(struct device *dev,
>> +					      void *res, void *data)
>> +{
>> +	struct fled_cdev **p = res;
> 
> We don't have struct fled_cdev. This name is used for variables
> of struct led_clssdev_flash type in drivers.
> 
> We don't get even compiler warning here because this is cast
> from void pointer.
> 
> Funny thing is that you seem to have followed similar flaw in
> devm_led_classdev_match() where struct led_cdev has been
> introduced.
> 
> We need to fix both cases.
> 
>> +
>> +	if (WARN_ON(!p || !*p))
>> +		return 0;
>> +
>> +	return *p == data;
>> +}
>> +
>> +void devm_led_classdev_flash_unregister(struct device *dev,
>> +				  	     struct led_classdev_flash *fled_cdev)
>> +{
>> +	WARN_ON(devres_release(dev,
>> +			       devm_led_classdev_flash_release,
>> +			       devm_led_classdev_flash_match, fled_cdev));
>> +}
>> +EXPORT_SYMBOL_GPL(devm_led_classdev_flash_unregister);
>> +
>>  static void led_clamp_align(struct led_flash_setting *s)
>>  {
>>  	u32 v, offset;
>> diff --git a/include/linux/led-class-flash.h b/include/linux/led-class-flash.h
>> index 1bd83159fa4c..21a3358a1731 100644
>> --- a/include/linux/led-class-flash.h
>> +++ b/include/linux/led-class-flash.h
>> @@ -113,6 +113,20 @@ static inline int led_classdev_flash_register(struct device *parent,
>>   */
>>  void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev);
>>  
>> +int devm_led_classdev_flash_register_ext(struct device *parent,
>> +				     struct led_classdev_flash *fled_cdev,
>> +				     struct led_init_data *init_data);
>> +
>> +
>> +static inline int devm_led_classdev_flash_register(struct device *parent,
>> +				     struct led_classdev_flash *fled_cdev)
>> +{
>> +	return devm_led_classdev_flash_register_ext(parent, fled_cdev, NULL);
>> +}
>> +
>> +void devm_led_classdev_flash_unregister(struct device *parent,
>> +					struct led_classdev_flash *fled_cdev);
>> +
>>  /**
>>   * led_set_flash_strobe - setup flash strobe
>>   * @fled_cdev: the flash LED to set strobe on
>>
> 

-- 
Best regards,
Jacek Anaszewski