netdev - Re: [PATCH] net/fec: carrier off initially to avoid root mount failure

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Message-Id: <20101008.103112.189689736.davem@davemloft.net>
Date:	Fri, 08 Oct 2010 10:31:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	oskar@...utronix.de
Cc:	netdev@...r.kernel.org, dan@...eddedalley.com,
	bigeasy@...utronix.de, hjk@...utronix.de
Subject: Re: [PATCH] net/fec: carrier off initially to avoid root mount
 failure

From: Oskar Schirmer <oskar@...utronix.de>
Date: Thu,  7 Oct 2010 14:30:30 +0200

> with hardware slow in negotiation, the system did freeze
> while trying to mount root on nfs at boot time.
> 
> the link state has not been initialised so network stack
> tried to start transmission right away. this caused instant
> retries, as the driver solely stated business upon link down,
> rendering the system unusable.
> 
> notify carrier off initially to prevent transmission until
> phylib will report link up.
> 
> Signed-off-by: Oskar Schirmer <oskar@...utronix.de>

Maybe fs_enet_open() is a better place for this netif_carrier_off()
call?

Every open the driver probes the PHY and does phy_start().
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