netdev - Re: 2.6.19-rc6-mm2: uli526x only works after reload

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Message-Id: <200611302232.03608.rjw@sisk.pl>
Date:	Thu, 30 Nov 2006 22:32:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: 2.6.19-rc6-mm2: uli526x only works after reload

[Trimmed the Cc list a bit.]

On Thursday, 30 November 2006 22:12, Andrew Morton wrote:
> On Thu, 30 Nov 2006 21:21:27 +0100
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > On Thursday, 30 November 2006 02:04, Rafael J. Wysocki wrote:
> > > On Thursday, 30 November 2006 00:26, Andrew Morton wrote:
> > > > On Thu, 30 Nov 2006 00:08:21 +0100
> > > > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > > > 
> > > > > On Wednesday, 29 November 2006 22:31, Rafael J. Wysocki wrote:
> > > > > > On Wednesday, 29 November 2006 22:30, Andrew Morton wrote:
> > > > > > > On Wed, 29 Nov 2006 21:08:00 +0100
> > > > > > > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > > > > > > 
> > > > > > > > On Wednesday, 29 November 2006 20:54, Rafael J. Wysocki wrote:
> > > > > > > > > On Tuesday, 28 November 2006 11:02, Andrew Morton wrote:
> > > > > > > > > > 
> > > > > > > > > > Temporarily at
> > > > > > > > > > 
> > > > > > > > > > http://userweb.kernel.org/~akpm/2.6.19-rc6-mm2/
> > > > > > > > > > 
> > > > > > > > > > Will appear eventually at
> > > > > > > > > > 
> > > > > > > > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.19-rc6/2.6.19-rc6-mm2/
> > > > > > > > > 
> > > > > > > > > A minor issue: on one of my (x86-64) test boxes the uli526x driver doesn't
> > > > > > > > > work when it's first loaded.  I have to rmmod and modprobe it to make it work.
> > > > > > > 
> > > > > > > That isn't a minor issue.
> > > > > > > 
> > > > > > > > > It worked just fine on -mm1, so something must have happened to it recently.
> > > > > > > > 
> > > > > > > > Sorry, I was wrong.  The driver doesn't work at all, even after reload.
> > > > > > > > 
> > > > > > > 
> > > > > > > tulip-dmfe-carrier-detection-fix.patch was added in rc6-mm2.  But you're
> > > > > > > not using that (corrent?)
> > > > > > > 
> > > > > > > git-netdev-all changes drivers/net/tulip/de2104x.c, but you're not using
> > > > > > > that either.
> > > > > > > 
> > > > > > > git-powerpc(!) alters drivers/net/tulip/de4x5.c, but you're not using that.
> > > > > > > 
> > > > > > > Beats me, sorry.  Perhaps it's due to changes in networking core.  It's
> > > > > > > presumably a showstopper for statically-linked-uli526x users.  If you could
> > > > > > > bisect it, please?  I'd start with git-netdev-all, then tulip-*.
> > > > > > 
> > > > > > OK, but it'll take some time.
> > > > > 
> > > > > OK, done.
> > > > > 
> > > > > It's one of these (the first one alone doesn't compile):
> > > > > 
> > > > > git-netdev-all.patch
> > > > > git-netdev-all-fixup.patch
> > > > > libphy-dont-do-that.patch
> > 
> > Hm, all of these patches are the same as in -mm1 which hasn't caused any
> > problems to appear on this box.
> > 
> > So, it seems there's another change between -mm1 and -mm2 that causes this
> > to happen.
> > 
> 
> It would be nice to eliminate libphy-dont-do-that.patch if poss - that was
> a rogue akpm patch aimed at some incomprehensible gobbledigook in the
> netdev tree (and to fix the current_is_keventd-not-exported-to-modules
> bug).

Unfortunately the kernel doesn't compile without it ...

Well, I think I'll try to find the patch that contains the change which has
triggered this.

Now it looks like the problem is 100% reproducible after a fresh poweron as
long as I don't run a non-failing kernel on the box.  [Symptoms tend to vary,
though.  Sometimes the reloading of uli526x doesn't help at all, sometimes
it makes the interface appear but without the possibility to transmit data,
and sometimes it makes the interface work.]

> I have a feeling that your bug will be cheerily merged into mainline soon. 
> That might of course mean that someone will hit it more firmly and it'll
> get fixed.

Yes, that's possible.
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