From: Alexander Graf <ag...@suse.de>
Date: Wed,  4 Apr 2018 00:19:35 +0200

> When using wicked with a lan78xx device attached to the system, we
> end up with ethtool commands issued on the device before an ifup
> got issued. That lead to the following crash:
> 
 ...
> The culprit is quite simple: The driver tries to access the phy left and 
> right,
> but only actually has a working reference to it when the device is up.
> 
> The fix thus is quite simple too: Get a reference to the phy on probe already
> and keep it even when the device is going down.
> 
> With this patch applied, I can successfully run wicked on my system and bring
> the interface up and down as many times as I want, without getting NULL 
> pointer
> dereferences in between.
> 
> Signed-off-by: Alexander Graf <ag...@suse.de>

Applied, thank you.
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