Holger Freyther wrote: > Switch from using a mutex to spinlock > to control the brightnes of the leds...
This is bogus. Spinlocks don't do anything on a uniprocessor - they're even removed during compilation. Here are some choices of what you can do if you need to lock something that can be called from an interrupt: - move it into a workqueue, so you can use locks that sleep or even omit them - similarly, use a tasklet instead of a lock - don't lock when in the interrupt code, and protect the non-interupt code by disabling interrupts while in the critical section (careful about what this does to interrupt latency !) - in the interrupt, probe the lock and do not perform the action if locked etc. - Werner
