linux-kernel - Re: [PATCH v3 1/3] leds: triggers: provide led_trigger_register

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Message-ID: <20180510112101.GD6977@amd>
Date:   Thu, 10 May 2018 13:21:01 +0200
From:   Pavel Machek <pavel@....cz>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Johan Hovold <johan@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-serial@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-can@...r.kernel.org, kernel@...gutronix.de,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-kernel@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] leds: triggers: provide
 led_trigger_register_format()

Hi!

> This allows one to simplify drivers that provide a trigger with a
> non-constant name (e.g. one trigger per device with the trigger name
> depending on the device's name).
> 
> Internally the memory the name member of struct led_trigger points to
> now always allocated dynamically instead of just taken from the caller.
> 
> The function led_trigger_rename_static() must be changed accordingly and
> was renamed to led_trigger_rename() for consistency, with the only user
> adapted.

Well, I'm not sure if we want to have _that_ many trigger. Trigger
interface is going to become.. "interesting".

We have 4K limit on total number of triggers. We use rather strange
interface to select trigger.

> @@ -115,13 +115,13 @@ static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
>  
>  	if (msg == NETDEV_CHANGENAME) {
>  		snprintf(name, sizeof(name), "%s-tx", netdev->name);
> -		led_trigger_rename_static(name, priv->tx_led_trig);
> +		led_trigger_rename(priv->tx_led_trig, name);
>  
>  		snprintf(name, sizeof(name), "%s-rx", netdev->name);
> -		led_trigger_rename_static(name, priv->rx_led_trig);
> +		led_trigger_rename(priv->rx_led_trig, name);
>  
>  		snprintf(name, sizeof(name), "%s-rxtx", netdev->name);
> -		led_trigger_rename_static(name, priv->rxtx_led_trig);
> +		led_trigger_rename(priv->rxtx_led_trig, name);
>  	}
>  

I know this is not your fault, but if you have a space or "[]" in
netdev names, confusing things will happen.

I believe we should have triggers "net-rx, net-tx" and it should have
parameter "which device it acts on". 
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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