Hi!

> We use the sysfs timer trigger of the led subsystem to control our leds (turn on, turn off, and blink).  While doing this we found a strange behavior.  If the values of delay_on and delay_off are ever both zero, the led subsystem will make the decision to blink at a 500ms on and 500ms off rate.
> 
> # cd /sys/class/leds/g01
> # cat delay_on
> 0
> # cat delay_off
> 86400
> # echo 0 > delay_off
> # cat delay_on
> 500
> # cat delay_off
> 500
> 
> drivers/led/led-core.c:184
>     /* blink with 1 Hz as default if nothing specified */
>     if (!*delay_on && !*delay_off)
>         *delay_on = *delay_off = 500;
> 
> Is there a reason that the kernel would decide to blink at this default rate instead of leaving the timer disabled?
>

Yep. It allows hardware to provide different values if it can only
blink at fixed rate.
								Pavel

-- 
http://www.livejournal.com/~pavelmachek