Re: [PATCH v2] platform/x86: Add WMI driver for Redmibook keyboard.

[foxidokun]

> > +	/* For linearizability */
> > +	guard(mutex)(&data->key_lock);
>
> What is the exact purpose of this mutex? What does it protect? 

It protects key sequence, so there wouldn't be race between two press & release combinations resuulting into press - press - release - release order.

--
Gladyshev Ilya