[PATCH] Switch leds from mutex to spinlock to work in atomic contexts

[Holger Freyther]

Hey,

cat /sys/class/leds/some-led/trigger will show you which triggers are 
available. echo "bat-charging" > trigger will enable the trigger for this 
led. Now doing this lead to a BUG call as mutex_lock will use might_sleep 
which is forbidden in atomic contexts. Switch from using a mutex to spinlock 
to control the brightnes of the leds...


this patch seems to work, mutex_destroy was replaced with nothing but that 
looks correct too.

z.

PS: The LED trigger for charging works but with a bigger delay... we might 
want to schedule something when usb was plugged as we know we are going to 
charge soon?
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