netdev - Re: [Regression in 2.6.29] forcedeth doesn't work after resume from hibernation (was: Re: Resume after hibernation regression in 2.6.29)

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Message-Id: <200904032226.21420.rjw@sisk.pl>
Date:	Fri, 3 Apr 2009 22:26:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Tvrtko A. Ursulin" <tvrtko@...ulin.net>
Cc:	Ed Swierk <eswierk@...stanetworks.com>,
	Pavel Machek <pavel@....cz>,
	"linux-pm" <linux-pm@...ts.linux-foundation.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Tobias Diedrich <ranma+kernel@...edrich.de>,
	Ayaz Abdulla <aabdulla@...dia.com>,
	netdev <netdev@...r.kernel.org>,
	Arthur Jones <ajones@...erbed.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Regression in 2.6.29] forcedeth doesn't work after resume from hibernation (was: Re: Resume after hibernation regression in 2.6.29)

On Friday 03 April 2009, Ed Swierk wrote:
> On Fri, 2009-04-03 at 08:24 -0700, Ed Swierk wrote:
> > On Fri, Mar 27, 2009 at 1:09 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > > I was able to reproduce the problem and identify the commit that broke the
> > > resume of forcedeth, which turned out to be:
> > >
> > > commit cb52deba12f27af90a46d2f8667a64888118a888
> > > Author: Ed Swierk <eswierk@...stra.com>
> > > Date:   Mon Dec 1 12:24:43 2008 +0000
> > >
> > >    forcedeth: power down phy when interface is down
> > >
> > >    Signed-off-by: Ed Swierk <eswierk@...stra.com>
> > >    Tested-by: Arthur Jones <ajones@...erbed.com>
> > >    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > >    Signed-off-by: David S. Miller <davem@...emloft.net>
> > >
> > > Since I have no slightest idea of what this commit is supposed to achieve,
> > > I can only ask for reverting it.  It reverts cleanly, BTW.
> > 
> > The change causes forcedeth to bring down the physical link when an
> > interface goes down; leaving it up causes the switch at the other end
> > to think the port is still active, with potentially random speed and
> > duplex parameters.
> > 
> > It's possible that the forcedeth driver needs to reset autonegotiation
> > after bringing it up the link again.
> > 
> > Can you please try this on a 2.6.29 kernel that's exhibiting the
> > symptoms you describe, after resuming the machine from hibernation:
> > 
> >   ethtool -s eth1 autoneg off speed 100 duplex full
> >   ethtool -s eth1 autoneg on
> > 
> > This should reset autonegotiation manually and bring the link. Let me
> > know how it goes.
> 
> Also please try this patch; it fixes the problem on my test system (a
> DFI board with an nVidia MCP55).
> 
> Signed-off-by: Ed Swierk <eswierk@...stanetworks.com>
> --
> --- linux-2.6.29.x86_64/drivers/net/forcedeth.c.orig	2009-03-23 16:12:14.000000000 -0700
> +++ linux-2.6.29.x86_64/drivers/net/forcedeth.c	2009-04-03 10:11:26.839614710 -0700
> @@ -5995,6 +5995,9 @@
>  	for (i = 0;i <= np->register_size/sizeof(u32); i++)
>  		writel(np->saved_config_space[i], base+i*sizeof(u32));
>  
> +	/* restore phy state, including autoneg */
> +	phy_init(dev);
> +
>  	netif_device_attach(dev);
>  	if (netif_running(dev)) {
>  		rc = nv_open(dev);

Tvrtko, can you test it, please?  I'll be away from my NVidia box during the
next couple of days.

Thanks,
Rafael
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