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

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Date:   Sat, 4 Nov 2023 15:29:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Klaus Kudielka <klaus.kudielka@...il.com>
Cc:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Samuel Holland <samuel@...lland.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Li Zetao <lizetao1@...wei.com>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: triggers: netdev: add a check, whether device is up

On Sat, Nov 04, 2023 at 01:58:40PM +0100, Klaus Kudielka wrote:
> Some net devices do not report NO-CARRIER, if they haven't been brought
> up.

Hi Klaus

We should probably fix the driver. What device is it?

> In that case, the netdev trigger results in a wrong link state being
> displayed. Fix this, by adding a check, whether the device is up.

Is it wrong? Maybe the carrier really is up, even if the interface is
admin down. Broadcast packets are being received by the
hardware. Maybe there is a BMC sharing the link and it is active?

It is not a clear cut wrong to me. And its a way to find broken
drivers. We might want to discuss this some more.

	Andrew