linux-kernel - Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

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Date:	Tue, 17 Nov 2015 07:42:46 +0000
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Álvaro Fernández Rojas <noltari@...il.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>
Cc:	Jonas Gorski <jogo@...nwrt.org>,
	Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of
 copying its functionality

On 16/11/15 21:33, Álvaro Fernández Rojas wrote:
> Still wrong, you are setting the led value after unlocking the spinlock.

I have to unlock it because bcm6328_led_set() locks that spinlock.

> El 16/11/2015 a las 21:24, Simon Arlott escribió:
>> When ensuring a consistent initial LED state in bcm6328_led (as they may
>> be blinking instead of on/off), the LED register is set using an inverted
>> copy of bcm6328_led_set(). To avoid further errors relating to active low
>> handling, call this function directly instead.
>>
>> As bcm6328_led_set() acquires the same spinlock again when updating the
>> register, it is called after unlocking.
>>
>> Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
>> ---
>>   drivers/leds/leds-bcm6328.c | 8 ++------
>>   1 file changed, 2 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/leds/leds-bcm6328.c b/drivers/leds/leds-bcm6328.c
>> index c7ea5c6..95d0cf9 100644
>> --- a/drivers/leds/leds-bcm6328.c
>> +++ b/drivers/leds/leds-bcm6328.c
>> @@ -314,14 +314,10 @@ static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
>>   	} else {
>>   		led->cdev.brightness = LED_OFF;
>>   	}
>> -
>> -	if ((led->active_low && led->cdev.brightness == LED_FULL) ||
>> -	    (!led->active_low && led->cdev.brightness == LED_OFF))
>> -		bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
>> -	else
>> -		bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
>>   	spin_unlock_irqrestore(lock, flags);
>>   
>> +	bcm6328_led_set(&led->cdev, led->cdev.brightness);
>> +
>>   	led->cdev.brightness_set = bcm6328_led_set;
>>   	led->cdev.blink_set = bcm6328_blink_set;
>>   
> 


-- 
Simon Arlott
--
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