netdev - Re: [PATCH] drivers/net: Call netif_carrier

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Message-ID: <483985247.35721.1297792863958.JavaMail.root@zmail07.collab.prod.int.phx2.redhat.com>
Date:	Tue, 15 Feb 2011 13:01:03 -0500 (EST)
From:	Ivan Vecera <ivecera@...hat.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, aabdulla@...dia.com,
	Ben Hutchings <ben@...adent.org.uk>,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: [PATCH] drivers/net: Call netif_carrier_off at the end of the
 probe

----- Original Message -----
> On Tue, 2011-02-15 at 16:22 +0100, Francois Romieu wrote:
> > Stated this way it sounds like a core dev layer issue.
> 
> ...
> > I am not completely sure after reading some history. Namely:
> > - (37e8273cd30592d3a82bcb70cbb1bdc4eaeb6b71 ?)
> > - c276e098d3ee33059b4a1c747354226cec58487c
> > - 22604c866889c4b2e12b73cbf1683bda1b72a313
> > - b47300168e770b60ab96c8924854c3b0eb4260eb
> >
> > I am confused.
> 
> Drivers that can report carrier state should do so initially some time
> between registering a device and bringing it up (either in the bus
> probe
> function or the ndo_open function). It generally seems to be safe to
> assume that the link is down initially, and then to rely on
> notifications from the hardware. However, that does depend on the
> behaviour of the hardware.
> 
Yes,that's true... forcedeth and r8169 are the drivers that detect link
state when device is opened and call netif_carrier_on(off) appropriately.

Ivan
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