netdev - Re: [PATCH] igc: fix a log entry using uninitialized netdev

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Date: Thu, 25 Apr 2024 00:34:31 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Corinna Vinschen <vinschen@...hat.com>
Cc: netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org
Subject: Re: [PATCH] igc: fix a log entry using uninitialized netdev

On Tue, Apr 23, 2024 at 12:24:54PM +0200, Corinna Vinschen wrote:
> During successful probe, igc logs this:
> 
> [    5.133667] igc 0000:01:00.0 (unnamed net_device) (uninitialized): PHC added
>                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> The reason is that igc_ptp_init() is called very early, even before
> register_netdev() has been called. So the netdev_info() call works
> on a partially uninitialized netdev.
> 
> Fix this by calling igc_ptp_init() after register_netdev(), right
> after the media autosense check, just as in igb.  Add a comment,
> just as in igb.

The network stack can start sending and receiving packet before
register_netdev() returns. This is typical of NFS root for example. Is
there anything in igc_ptp_init() which could cause such packet
transfers to explode?

A better fix is to allocate the device name earlier. A few drivers
call dev_alloc_name().

     Andrew