linux-kernel - Re: Linux 2.6.24.1 - kernel does not boot; IRQ trouble?

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Date:	Fri, 22 Feb 2008 10:11:33 +0100
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Stephen Hemminger" <shemminger@...ux-foundation.org>
Cc:	"Chris Rankin" <rankincj@...oo.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Linux 2.6.24.1 - kernel does not boot; IRQ trouble?

On Tue, Feb 19, 2008 at 9:47 AM, Kay Sievers <kay.sievers@...y.org> wrote:
> On Feb 18, 2008 9:06 PM, Stephen Hemminger <shemminger@...ux-foundation.org> wrote:
>  > On Mon, 18 Feb 2008 19:42:25 +0000 (GMT)
>  > Chris Rankin <rankincj@...oo.com> wrote:
>  >
>  > > --- Stephen Hemminger <shemminger@...ux-foundation.org> wrote:
>  > > > > > sysfs: duplicate filename 'bridge' can not be created
>  > > > > > WARNING: at fs/sysfs/dir.c:424 sysfs_add_one()
>  > > > > > Pid: 1, comm: swapper Not tainted 2.6.24.1 #1
>  > > > > >  [<c0105020>] show_trace_log_lvl+0x1a/0x2f
>  > > > > >  [<c0105990>] show_trace+0x12/0x14
>  > > > > >  [<c010613d>] dump_stack+0x6c/0x72
>  > > > > >  [<c01991bf>] sysfs_add_one+0x57/0xbc
>  > > > > >  [<c0199e41>] sysfs_create_link+0xc2/0x10d
>  > > > > >  [<c01bae9a>] pci_bus_add_devices+0xbd/0x103
>  > > > > >  [<c034016c>] pci_legacy_init+0x56/0xe3
>  > > > > >  [<c03274e1>] kernel_init+0x157/0x2c3
>  > > > > >  [<c0104c83>] kernel_thread_helper+0x7/0x10
>  > > > > >  =======================
>  > > > > > pci 0000:00:01.0: Error creating sysfs bridge symlink, continuing...
>  > > > > > sysfs: duplicate filename 'bridge' can not be created
>  > > > > > WARNING: at fs/sysfs/dir.c:424 sysfs_add_one()

Greg,
it seems that:
  arch/x86/pci/legacy.c :: pci_legacy_init()

tries to create already created "bridge" symlinks in 2.6.24. So we
discover the same devices twice? Can this be a reason for the hang?

I guess in 2.6.25, the warning is gone with:
  commit fd7d1ced29e5beb88c9068801da7a362606d8273
  Author: Greg Kroah-Hartman <gregkh@...e.de>
  Date:   Tue May 22 22:47:54 2007 -0400

  PCI: make pci_bus a struct device

  This moves the pci_bus class device to be a real struct device and at
  the same time, place it in the device tree in the correct location.
  Note, the old "bridge" symlink is now gone.

Thanks,
Kay
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