netdev - Re: [PATCH] sky2: fix hard hang with netconsoling and iface going up

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Message-ID: <20090201223853.GB6567@x200.localdomain>
Date:	Mon, 2 Feb 2009 01:38:53 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	shemminger@...ux-foundation.org, jgarzik@...ox.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: fix hard hang with netconsoling and iface going
	up

On Fri, Jan 30, 2009 at 02:59:07PM +0300, Alexey Dobriyan wrote:
> On Thu, Jan 29, 2009 at 05:00:43PM -0800, David Miller wrote:
> > From: Alexey Dobriyan <adobriyan@...il.com>
> > Date: Tue, 27 Jan 2009 16:27:18 +0300
> > 
> > > [PATCH] sky2: fix hard hang with netconsoling and iface going up
> > > 
> > > Printing anything over netconsole before hw is up and running is,
> > > of course, not going to work.
> > > 
> > > Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> > 
> > Alexey, can you get this tested by the reporter to make sure
> > it really fixes the hang?
> 
> I'm the reporter and tester and using this patch successfully. :-)
> 
> > Once it's been tested, I'll apply it.
> 
> As for other printks, someone with 8139cp should experience the same bug.

Strangely enough, 8139cp survives with no message printed and no hang or
anything. But this is with qemu/kvm.

	static int cp_open (struct net_device *dev)
	{
	        struct cp_private *cp = netdev_priv(dev);
	        int rc;

	        if (netif_msg_ifup(cp))
	                printk(KERN_DEBUG "%s: enabling interface\n", dev->name);

	        rc = cp_alloc_rings(cp);
			...
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