Re: [PATCH] leds: trigger: use RCU to protect the led_cdevs list

Hi Pavel,

...

Cc: stable@vger.kernel.org

I ... don't like idea of this going to stable.

OK, I guess that's fair. We've been running into the lockdep report for a while - ever since we made the spinlock in iwlwifi no longer disable IRQs all the time, which was meant to be a good thing ...

However, the scenario that could cause *real* deadlocks there is really unlikely and requires four CPUs all doing the exactly right thing, including a normally very rare *write lock* on the leddev_list_lock, so I don't think in practice it'll be much of an issue.

johannes