netdev - Re: [PATCH RFC leds + net-next 4/7] leds: trigger: netdev: support HW offloading

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Message-ID: <20210301104404.GC31897@duo.ucw.cz>
Date:   Mon, 1 Mar 2021 11:44:04 +0100
From:   Pavel Machek <pavel@....cz>
To:     Marek Behún <kabel@...nel.org>
Cc:     netdev@...r.kernel.org, linux-leds@...r.kernel.org,
        Dan Murphy <dmurphy@...com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Ben Whitten <ben.whitten@...il.com>
Subject: Re: [PATCH RFC leds + net-next 4/7] leds: trigger: netdev: support
 HW offloading

Hi!

> Add support for HW offloading of the netdev trigger.
> 
> We need to change spinlock to mutex, because if spinlock is used, the
> trigger_offload() method cannot sleep, which can happen for ethernet
> PHYs.

Is that bugfix or just needed for offloading? Should be separate patch
in any case.

> Move struct led_trigger_data into global include directory, into file
> linux/ledtrig.h, so that drivers wanting to offload the trigger can
> access its settings.

Separate...

> @@ -327,12 +310,14 @@ static int netdev_trig_notify(struct notifier_block *nb,
>  	case NETDEV_CHANGE:
>  		if (netif_carrier_ok(dev))
>  			trigger_data->linkup = 1;
> +		reset = !trigger_data->led_cdev->offloaded;
>  		break;
>  	}
>  
> -	set_baseline_state(trigger_data);
> +	if (reset)
> +		set_baseline_state(trigger_data);
>  
> -	spin_unlock_bh(&trigger_data->lock);
> +	mutex_unlock(&trigger_data->lock);
>  
>  	return NOTIFY_DONE;
>  }

Is this the only thing it saves? Because.. that would not be worth
it.

Best regards,
									Pavel

-- 
http://www.livejournal.com/~pavelmachek

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