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

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Date: Sat, 4 Nov 2023 17:42:32 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
Cc: Klaus Kudielka <klaus.kudielka@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] leds: triggers: netdev: add a check, whether device is up

On Sat, Nov 04, 2023 at 05:46:44PM +0100, Andrew Lunn wrote:
> 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...

... and I think we should.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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