linux-kernel - Re: [PATCH net] net: hyperv: initialize link status correctly

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Date:	Mon, 27 Jan 2014 00:35:59 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	kys@...rosoft.com, haiyangz@...rosoft.com,
	devel@...uxdriverproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: hyperv: initialize link status correctly

From: Jason Wang <jasowang@...hat.com>
Date: Mon, 27 Jan 2014 15:30:54 +0800

> Call netif_carrier_on() after register_device(). Otherwise it won't work since
> the device was still in NETREG_UNINITIALIZED state.
> 
> Fixes a68f9614614749727286f675d15f1e09d13cb54a
> (hyperv: Fix race between probe and open calls)
> 
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: K. Y. Srinivasan <kys@...rosoft.com>
> Reported-by: Di Nie <dnie@...hat.com>
> Tested-by: Di Nie <dnie@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

A device up can occur at the moment you call register_netdevice(),
therefore that up call can see the carrier as down and fail or
similar.  So you really cannot resolve the carrier to be on in this
way.
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