linux-kernel - Re: 2.6.20.git regression: 'PCI: add the sysfs driver name to all modules' causes hard hang on boot

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Message-Id: <1171785752.6787.17.camel@Homer.simpson.net>
Date:	Sun, 18 Feb 2007 09:02:32 +0100
From:	Mike Galbraith <efault@....de>
To:	Greg KH <greg@...ah.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.20.git regression: 'PCI: add the sysfs driver name to all
	modules' causes hard hang on boot

On Sat, 2007-02-17 at 09:20 +0100, Mike Galbraith wrote:
> On Fri, 2007-02-16 at 17:50 -0800, Greg KH wrote:
> > On Sat, Feb 17, 2007 at 02:38:08AM +0100, Mike Galbraith wrote:
> > > On Fri, 2007-02-16 at 14:36 -0800, Greg KH wrote:
> > > > On Fri, Feb 16, 2007 at 10:55:10AM +0100, Mike Galbraith wrote:
> > > > > Greetings,
> > > > > 
> > > > > Per $subject, git.yesterday hangs hard on boot here. A git bisect
> > > > > fingered the commit below, which I verified via git bisect reset; git
> > > > > revert -n 725522b5453dd680412f2b6463a988e4fd148757, after which box
> > > > > boots fine.  (well, I hope I verified... i'm git-ignorant)
> > > > 
> > > > If you change CONFIG_SYSFS_DEPRECATED to Y, does that solve the problem?
> > > 
> > > It's already set.
> > 
> > It's not set in the config file you sent to me and the list :)
> 
> Oops.  (Lysdexic mouse, or friends+Aerosmith+beer+2:30A.M.:) Makes no
> difference.  Nada from nmi_watchdog either btw.

The reason it's hanging is that nobody releases the driver, so we wait
forever in driver_unregister().  With the below, box boots fine...

--- drivers/base/bus.c.org	2007-02-18 08:38:57.000000000 +0100
+++ drivers/base/bus.c	2007-02-18 08:39:09.000000000 +0100
@@ -593,6 +593,7 @@ void bus_remove_driver(struct device_dri
 	driver_detach(drv);
 	module_remove_driver(drv);
 	kobject_unregister(&drv->kobj);
+	driver_release(&drv->kobj);
 	put_bus(drv->bus);
 }
 

...but that can't be right given that the darn thing booted just fine
prior to the naming patch with an equally unhappy init_ipmi_si().  Hmm.

	-Mike

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