linux-kernel - Re: [RFC PATCH 0/1] Add generic inverted led triggers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 8 Mar 2020 22:26:49 +0100
From:   Pavel Machek <pavel@....cz>
To:     Tobias Schramm <t.schramm@...jaro.org>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/1] Add generic inverted led triggers

Hi!

> This patch adds generic inverted LED triggers. With this patch applied
> any trigger can be used with inverted brightness levels by appending
> "-inverted" to the name of a trigger.

Not a big fan (sorry).

We have already _way_ too many triggers, we don't want to have twice
that much.

> This is can be useful for devices that do not have dedicated LEDs for e.g.
> disk activity indication. With this patch applied the power led can be set
>  to default-state = on and trigger = disk-activity-inverted. Then the led
> will be on by default, indicating the power state of the device but it
> will turn off briefly whenever there is disk activity.

Better implementation might be to have a trigger attribute doing the
inverting.

> I think dual-use of LEDs might come in handy for quite a few devices since
> a lot of embedded boards and upcoming ARM based notebooks do only have one
> or two LEDs.

Inverting really does not work with all the triggers; numlock-inverted
will not get too many
users. always-on-inverted... blink-inverted.... I guess it does make
sense for disk activity (but be warned disk can be continuously active
for quite a while).

What triggers do you think make sense inverted?

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Download attachment "signature.asc" of type "application/pgp-signature" (182 bytes)