Re: [PATCH 2.6.24-rc3] Fix /proc/net breakage

From: Andreas Mohr <andi@lisas.de>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andreas Mohr <andi@lisas.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Woodhouse <dwmw2@infradead.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"Rafael J. Wysocki" <rjw@sisk.pl>, Pavel Machek <pavel@ucw.cz>,
	kernel list <linux-kernel@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	Pavel Emelyanov <xemul@openvz.org>,
	"Denis V. Lunev" <den@openvz.org>
Subject: Re: [PATCH 2.6.24-rc3] Fix /proc/net breakage
Date: Fri, 28 Dec 2007 08:21:16 +0100	[thread overview]
Message-ID: <20071228072116.GA16553@rhlx01.hs-esslingen.de> (raw)
In-Reply-To: <20071228062201.GA2071@martell.zuzino.mipt.ru>

Hi,

On Fri, Dec 28, 2007 at 09:22:01AM +0300, Alexey Dobriyan wrote:
> On Thu, Dec 27, 2007 at 11:17:28PM +0100, Andreas Mohr wrote:
> > And this is the state that my 2.6.24-rc_six_-mm1 tree is in already.
> 
> OK.
> 
> > So either it didn't help here or it broke again by some later change or
> > there's some dumb PEBKAC error here.
> 
> Do you by chance forgot CONFIG_USB_?HCI_HCD=y ? I see empty usbfs here if
> they are deselected.

Quite well-educated guess! In fact I had already discovered that
ohci-hcd fails to load, at all. Doh.
(however after going through all recent ohci.*hcd related LKML postings
it seems there's no report about such problems yet)

Sorry for barking up the entirely wrong tree!

For giggles, here's the output:

# modprobe ohci-hcd
FATAL: Error inserting ohci_hcd (/lib/modules/2.6.24-rc6-mm1-gate/kernel/drivers/usb/host/ohci-hcd.ko): No such device

dmesg:
ohci_hcd: 2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver
ohci_hcd: block sizes: ed 64 td 64

(yes, that's all there is, despite CONFIG_USB_DEBUG being set)

The LED of a usb stick isn't active either, for obvious reasons.

And keep in mind that this is a (relatively old) OHCI-only machine...
(which had the 2.6.19 lsmod showing ohci-hcd just fine and working fine
with WLAN USB)

Now pondering whether to try -rc6 proper or whether to revert specific
guilty-looking USB changes...
And wondering how to properly elevate this issue (prompt Greg about it,
new thread, bug #, ...?)

Thanks,

Andreas Mohr