On 2021-09-27 17:44:51 [+0200], Pavel Machek wrote:

Would you mind reading and responding to the rest of the email?

The patch you mentioned,
  https://https://lkml.kernel.org/r/.kernel.org/all/20210915181601.99a68f5718be.I1a28b342d2d52cdeeeb81ecd6020c25cbf1dbfc0@changeid/

would remove the lock from led_trigger_event().
Are there any guarantees how many callbacks maybe invoked and what kind
of locks may be acquired?
Leaving kworker usage aside there are still things like spinlock_t usage
in input_leds_brightness_set(), nic78bx_brightness_set() (from a quick
grep) which have the same problems.

I'm not applying this.

I hope you reconsider. It is not all LED usage, just the CPU trigger.

								Pavel

Sebastian