netdev - Re: i217-LM boot wreckage

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Date:	Thu, 20 Mar 2014 14:45:19 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	netdev@...r.kernel.org
cc:	todd.fujinaka@...el.com, e1000-devel@...ts.sourceforge.net
Subject: Re: i217-LM boot wreckage

On Thu, 20 Mar 2014, Thomas Gleixner wrote:
> So it looks like the BIOS is setting something up, when the cable is
> plugged at power on time, which is not visible through our debug
> output.

Some more info:

I prevented e1000e from being autoloaded and booted with the cable
unplugged.

T1:
  Plug cable 
  modprobe e1000e	-> Works

T2:
  modprobe e1000e
  plug cable		-> Works not

  rmmod e1000e
  modprobe e1000e	-> works not

  unplug cable
  rmmod e1000e
  modprobe e1000e	-> works

  rmmod e1000e
  unplug cable     
  modprobe e1000e
  plug cable		-> Works not

  rmmod e1000e
  unplug cable     
  plug cable
  modprobe e1000e	-> Works not

So if the module is loaded w/o the cable plugged it does not work. If
I unplug before unloading the module and then plug in before loading
the module again it works again.

Thanks,

	tglx

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