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

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  Re: [PATCH 1/2] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Jacek Anaszewski <j.anaszewski@samsung.com> - 2015-11-16 15:40 +0100
    [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Simon Arlott <simon@fire.lp0.eu> - 2015-11-16 21:30 +0100
      Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Álvaro Fernández Rojas <noltari@gmail.com> - 2015-11-16 22:40 +0100
        Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Simon Arlott <simon@fire.lp0.eu> - 2015-11-17 08:50 +0100
          Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Jacek Anaszewski <j.anaszewski@samsung.com> - 2015-11-17 09:10 +0100
            Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Jacek Anaszewski <j.anaszewski@samsung.com> - 2015-11-17 09:20 +0100
              [PATCH 1/2 (v3)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Simon Arlott <simon@fire.lp0.eu> - 2015-11-22 21:50 +0100
                Re: [PATCH 1/2 (v3)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Jacek Anaszewski <j.anaszewski@samsung.com> - 2015-11-23 11:30 +0100
      Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of  copying its functionality Jacek Anaszewski <j.anaszewski@samsung.com> - 2015-11-23 11:30 +0100

#1270238 — Re: [PATCH 1/2] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

Hi Simon,

On 11/15/2015 02:32 PM, Simon Arlott wrote:
> 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.
>
> Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
> ---
> I've decided not to move the locking as it should really cover the
> setting of led->cdev.brightness too (not that it matters as the device
> is not yet registered).
>
>   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);
> +

You're not protecting bcm6328_led_set with spin_lock here.
Please describe why this is not needed in the commit message.

>   	led->cdev.brightness_set = bcm6328_led_set;
>   	led->cdev.blink_set = bcm6328_blink_set;
>
>


-- 
Best Regards,
Jacek Anaszewski
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#1270553 — [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

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@fire.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;
 
-- 
2.1.4

-- 
Simon Arlott
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#1270618 — Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

Still wrong, you are setting the led value after unlocking the 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@fire.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;
>   

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#1270934 — 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@fire.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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#1270941 — Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

Hi Alvaro, Simon,

On 11/17/2015 08:42 AM, Simon Arlott wrote:
> 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.

Commit message from the first version of the patch justified that
properly. It should be preserved in the final patch:

As bcm6328_led_set() expects to acquire the spinlock, narrow the locking
to only cover reading of the current state. There is no need to hold the
spinlock between reading the current value and setting it again because
the LED device has not yet been registered.

>> 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@fire.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;
>>>
>>
>
>


-- 
Best Regards,
Jacek Anaszewski
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#1270946 — Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

On 11/17/2015 09:06 AM, Jacek Anaszewski wrote:
> Hi Alvaro, Simon,
>
> On 11/17/2015 08:42 AM, Simon Arlott wrote:
>> 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.
>
> Commit message from the first version of the patch justified that
> properly. It should be preserved in the final patch:
>
> As bcm6328_led_set() expects to acquire the spinlock, narrow the locking
> to only cover reading of the current state. There is no need to hold the
> spinlock between reading the current value and setting it again because
> the LED device has not yet been registered.

Hmm, if so, then spin_lock in bcm6328_led isn't needed at all, as it
is guaranteed that no concurrent process will be executing this
function.

>>> 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@fire.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;
>>>>
>>>
>>
>>
>
>


-- 
Best Regards,
Jacek Anaszewski
--
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#1274949 — [PATCH 1/2 (v3)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

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() expects to acquire the spinlock, call it after
unlocking. There is no need to hold the spinlock between reading the
current value and setting it again because the LED device has not yet
been registered.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
---
On 17/11/15 08:15, Jacek Anaszewski wrote:
> On 11/17/2015 09:06 AM, Jacek Anaszewski wrote:
>> On 11/17/2015 08:42 AM, Simon Arlott wrote:
>>> 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.
>>
>> Commit message from the first version of the patch justified that
>> properly. It should be preserved in the final patch:
>>
>> As bcm6328_led_set() expects to acquire the spinlock, narrow the locking
>> to only cover reading of the current state. There is no need to hold the
>> spinlock between reading the current value and setting it again because
>> the LED device has not yet been registered.
> 
> Hmm, if so, then spin_lock in bcm6328_led isn't needed at all, as it
> is guaranteed that no concurrent process will be executing this
> function.

No, it's still required because it has to protect the read/modify/write
for all the other LED devices that use the same register.

 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;
 
-- 
2.1.4

-- 
Simon Arlott
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#1275223 — Re: [PATCH 1/2 (v3)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

On 11/22/2015 09:40 PM, Simon Arlott wrote:
> 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() expects to acquire the spinlock, call it after
> unlocking. There is no need to hold the spinlock between reading the
> current value and setting it again because the LED device has not yet
> been registered.
>
> Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
> ---
> On 17/11/15 08:15, Jacek Anaszewski wrote:
>> On 11/17/2015 09:06 AM, Jacek Anaszewski wrote:
>>> On 11/17/2015 08:42 AM, Simon Arlott wrote:
>>>> 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.
>>>
>>> Commit message from the first version of the patch justified that
>>> properly. It should be preserved in the final patch:
>>>
>>> As bcm6328_led_set() expects to acquire the spinlock, narrow the locking
>>> to only cover reading of the current state. There is no need to hold the
>>> spinlock between reading the current value and setting it again because
>>> the LED device has not yet been registered.
>>
>> Hmm, if so, then spin_lock in bcm6328_led isn't needed at all, as it
>> is guaranteed that no concurrent process will be executing this
>> function.
>
> No, it's still required because it has to protect the read/modify/write
> for all the other LED devices that use the same register.

Right, other already registered LED class devices can interfere.

>   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;
>
>


-- 
Best Regards,
Jacek Anaszewski
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#1275224 — Re: [PATCH 1/2 (v2)] leds-bcm6328: Reuse bcm6328_led_set() instead of copying its functionality

On 11/16/2015 09:24 PM, Simon Arlott wrote:
> 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@fire.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;
>
>

Applied, thanks.

-- 
Best Regards,
Jacek Anaszewski
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