linux-kernel - Re: [PATCH] pci: fix no_pci

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Message-Id: <200901161041.10071.jbarnes@virtuousgeek.org>
Date:	Fri, 16 Jan 2009 10:41:09 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Greg KH <gregkh@...e.de>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pci: fix no_pci_devices() #2

On Tuesday, January 6, 2009 4:42 pm Greg KH wrote:
> On Mon, Jan 05, 2009 at 11:09:43AM -0800, Jesse Barnes wrote:
> > On Saturday, December 20, 2008 3:14 am Vegard Nossum wrote:
> > > On Sat, Dec 20, 2008 at 11:56 AM, Vegard Nossum
> > > <vegard.nossum@...il.com>
> >
> > wrote:
> > > > On Sat, Dec 20, 2008 at 9:58 AM, Greg KH <gregkh@...e.de> wrote:
> > > >> Care to make a patch for no_pci_devices() to work properly in this
> > > >> kind of situation?
> > > >
> > > > How does this look?
> > > >
> > > > I have introduced a variable pci_is_initiated, which is set after the
> > > > bus has been registered.
> > >
> > > This patch is simpler and also works for me. But I am not too fond of
> > > it either...
> > >
> > >
> > > Vegard
> > >
> > >
> > > From 1f047c86fc7a831d85174452da92344a3582a158 Mon Sep 17 00:00:00 2001
> > > From: Vegard Nossum <vegard.nossum@...il.com>
> > > Date: Sat, 20 Dec 2008 12:08:18 +0100
> > > Subject: [PATCH] pci: fix no_pci_devices() #2
> > >
> > > In short, no_pci_devices() should not use bus_find_device() before
> > > initcalls have run, because the pci bus structure has not been
> > > initialized yet.
> > >
> > > Reference: http://lkml.org/lkml/2008/12/20/21
> > >
> > > Cc: Greg KH <gregkh@...e.de>
> > > Cc: Pekka Enberg <penberg@...helsinki.fi>
> > > Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
> > > ---
> > >  drivers/base/bus.c  |    1 +
> > >  drivers/pci/probe.c |    3 +++
> > >  2 files changed, 4 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/drivers/base/bus.c b/drivers/base/bus.c
> > > index 5aee1c0..5e83faf 100644
> > > --- a/drivers/base/bus.c
> > > +++ b/drivers/base/bus.c
> > > @@ -931,6 +931,7 @@ bus_devices_fail:
> > >  bus_uevent_fail:
> > >  	kset_unregister(&bus->p->subsys);
> > >  	kfree(bus->p);
> > > +	bus->p = NULL;
> > >  out:
> > >  	return retval;
> > >  }
> > > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> > > index 003a9b3..d561be7 100644
> > > --- a/drivers/pci/probe.c
> > > +++ b/drivers/pci/probe.c
> > > @@ -35,6 +35,9 @@ int no_pci_devices(void)
> > >  	struct device *dev;
> > >  	int no_devices;
> > >
> > > +	if (!pci_bus_type.p)
> > > +		return 1;
> > > +
> > >  	dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
> > >  	no_devices = (dev == NULL);
> > >  	put_device(dev);
> >
> > Assuming Greg already took the generic part, can you resend the PCI part
> > to the linux-pci@...r.kernel.org list for review just in case anyone has
> > a better idea of how to do it?
>
> Did I take the generic part?  I can't remember...

Doesn't look like it.  Vergard can you send out an updated patch set?

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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