netdev - Set __LINK_STATE_NOCARRIER in register

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Message-ID: <82793a62-054b-75e1-d302-74375f61ae03@gmail.com>
Date:   Tue, 16 Nov 2021 21:47:21 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Set __LINK_STATE_NOCARRIER in register_netdevice() ?

Quite some network drivers call netif_carrier_off() in their probe() function.
So I'm wondering whether we can/should add a
set_bit(__LINK_STATE_NOCARRIER, &dev->state)
to register_netdevice() and remove all these netif_carrier_off() calls.

Question is whether there's any scenario where a driver would depend on bit
__LINK_STATE_NOCARRIER being cleared after registering the netdevice
or where we want to preserve the state of this bit.