netdev - Re: [PATCH] leds: triggers: netdev: add a check, whether device is up

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Date: Sat, 4 Nov 2023 17:46:44 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Klaus Kudielka <klaus.kudielka@...il.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, netdev <netdev@...r.kernel.org>,
	Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH] leds: triggers: netdev: add a check, whether device is up

On Sat, Nov 04, 2023 at 05:32:19PM +0100, Klaus Kudielka wrote:
> On Sat, 2023-11-04 at 16:27 +0100, Klaus Kudielka wrote:
> > 
> > phylink_start() is the first one that does netif_carrier_off() and thus
> > sets the NOCARRIER bit, but that only happens when bringing the device up.
> > 
> > Before that, I would not know who cares about setting the NOCARRIER bit.
> 
> A different, driver-specific solution could be like this (tested and working):
> 
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -5690,6 +5690,7 @@ static int mvneta_probe(struct platform_device *pdev)
>         /* 9676 == 9700 - 20 and rounding to 8 */
>         dev->max_mtu = 9676;
>  
> +       netif_carrier_off(dev);
>         err = register_netdev(dev);
>         if (err < 0) {
>                 dev_err(&pdev->dev, "failed to register\n");
> 
> 
> Would that be the "correct" approach?

Crossing emails.

Its a better approach. But it fixes just one driver. If we can do this
in phylink_create(), we fix it in a lot of drivers with a single
change...

	Andrew