linux-kernel - Re: [PATCH v4] rfkill: Add rfkill-any LED trigger

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Date:   Fri, 06 Jan 2017 13:22:13 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Michał Kępień <kernel@...pniu.pl>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Михаил Кринкин 
        <krinkin.m.u@...il.com>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] rfkill: Add rfkill-any LED trigger

On Fri, 2017-01-06 at 07:07 +0100, Michał Kępień wrote:
> Add a new "global" (i.e. not per-rfkill device) LED trigger, rfkill-
> any,
> which may be useful on laptops with a single "radio LED" and multiple
> radio transmitters.  The trigger is meant to turn a LED on whenever
> there is at least one radio transmitter active and turn it off
> otherwise.
> 
> Signed-off-by: Michał Kępień <kernel@...pniu.pl>
> ---
> Changes from v3:
> 
>   - Revert introducing a new bitfield and instead defer LED event
> firing
>     to a work queue to prevent conditional locking and ensure the
>     trigger can really be used from any context.  This also voids the
>     need to take rfkill_global_mutex before calling
> rfkill_set_block()
>     in rfkill_resume().

Looks better, but

> +static struct work_struct rfkill_any_work;

At least on module exit you need to cancel this work.

johannes