Re: [Debug 0/2] Fix regressions caused by commit 593669c2ac0f

From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Bernhard Thaler <bernhard.thaler@wvnet.at>,
	Jiang Liu <jiang.liu@linux.intel.com>
Cc: lenb@kernel.org, linux-acpi@vger.kernel.org,
	Bjorn Helgaas <bhelgaas@google.com>,
	Linux PCI <linux-pci@vger.kernel.org>
Subject: Re: [Debug 0/2] Fix regressions caused by commit 593669c2ac0f
Date: Sat, 21 Mar 2015 01:47:14 +0100	[thread overview]
Message-ID: <2663880.nZ5V9XMenj@vostro.rjw.lan> (raw)
In-Reply-To: <550C5A08.3020302@wvnet.at>

On Friday, March 20, 2015 06:34:00 PM Bernhard Thaler wrote:
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> 
> On 19.03.2015 12:27, Rafael J. Wysocki wrote:
> > On Thursday, March 19, 2015 08:10:44 AM Bernhard Thaler wrote:
> > > This is a multi-part message in MIME format.
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> > > Hi,
> > >
> > > I think this regression is not yet solved.
> >
> > First off, it is good to CC the commit author too (CCed now).
> >
> > > I encounter this or a similar problem with an PC Engines APU.1C device
> > > (see: http://pcengines.ch/apu.htm). It has 3 network interfaces each
> > > requiring the r8169 kernel module.
> > >
> > > With 4.0.0-rc4 I get this error message at boot (for each of the 3 devices):
> > >
> > > [    3.562301] r8169 0000:01:00.0 (unnamed net_device) (uninitialized):
> > > rtl_chipcmd_cond == 1 (loop: 100, delay: 100).
> > >
> > > "ifconfig -a" shows ff:ff:ff:ff:ff:ff as MAC address for each of the
> > > interfaces (see eth0 as example):
> > >
> > > eth0      Link encap:Ethernet  HWaddr ff:ff:ff:ff:ff:ff
> > >           BROADCAST PROMISC MULTICAST  MTU:1500  Metric:1
> > >           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> > >           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> > >           collisions:0 txqueuelen:1000
> > >           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
> > >
> > > The network interfaces cannot be brought up/used.
> > >
> > > The same device and setup did work with a previously used 3.18.0-rc5
> > > kernel. When I boot it with this 3.18.0-rc5 kernel everything i OK,
> > > interfaces come up and work.
> >
> > Second, it is not entirely clear to me that what you're seeing is actually
> > the same regression.  Have you tested 4.0.0-rc4 with commit 593669c2ac0f
> > reverted?
> >
> You are right, I was a bit quick about this conclusion. I based it on
> Thomas Voegtle
> bisect in http://www.spinics.net/lists/linux-pci/msg39014.html and my own
> observation of the same problem situation with 4.0.0-rc4.
> 
> Test Results:
> 
> * Everything works fine before 593669c2ac0f, network interfaces are
> available
>    and usable e.g. with 812dbd9.
> 
> * The problem starts for me with 593669c2ac0f as, errors at boot, network
>    interfaces unusable as stated above.

And it doesn't go away in 4.0-rc4 which indicates that the fixes applied
so far do not work for you.

Gerry, can you please help here?

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.