linux-kernel - Re: [RFC PATCH 2/2] leds: trigger: implement block trigger

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Date:   Mon, 3 May 2021 12:11:34 +0200
From:   Pavel Machek <pavel@....cz>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Enzo Matsumiya <ematsumiya@...e.de>, linux-leds@...r.kernel.org,
        linux-block@...r.kernel.org, u.kleine-koenig@...gutronix.de,
        Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] leds: trigger: implement block trigger

Hi!

Please trim the emails you are responding to.

> >+MODULE_AUTHOR("Enzo Matsumiya <ematsumiya@...e.de>");
> >+MODULE_DESCRIPTION("LED block trigger");
> >+MODULE_LICENSE("GPL v2");
> >+
> >
> As already commented on, this for_each_blk() construct is not a good idea.
> Infact, I guess it would be better if you could invert the logic:
> Not having the block trigger enumerating all devices, but rather let the
> devices register with the block trigger.
> That would have the benefit that one could choose which block device should
> be handled by the LED trigger subsystem, _and_ you would avoid the need for
> a for_each_blk() construct.
> Thing is, I don't think that all block devices should be handled by the LED
> trigger; eg for things like 'loop' or 'ramdisk' it is very
> >questionable.

> Downside is that you would need to modify the drivers, but realistically
> there are only very few drivers which should be modified; I would go for
> nvme-pci and the sd driver for starters. Maybe floppy, but arguably that can
> omitted as one has a very good audio indicator for floppy accesses
> :-)

And we already have disk activity trigger. Maybe NVMe and SD needs to
be modified to use it?

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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