linux-kernel - Re: [PATCH 22/54] kset: convert /sys/devices/system to use kset

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Message-ID: <20071105185828.GA31896@suse.de>
Date:	Mon, 5 Nov 2007 10:58:28 -0800
From:	Greg KH <gregkh@...e.de>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH 22/54] kset: convert /sys/devices/system to use
	kset_create

On Mon, Nov 05, 2007 at 07:11:09PM +0100, Cornelia Huck wrote:
> On Fri,  2 Nov 2007 16:59:00 -0700,
> Greg Kroah-Hartman <gregkh@...e.de> wrote:
> 
> > Dynamically create the kset instead of declaring it statically.
> > 
> > Cc: Kay Sievers <kay.sievers@...y.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> > ---
> >  drivers/base/sys.c |   28 ++++++++++++----------------
> >  1 files changed, 12 insertions(+), 16 deletions(-)
> 
> Unfortunately, at that point in the patch series reipl breaks for me :(
> 
> I used the following silly debug patch:

What does reipl have to do with shutdown?

> ---
>  drivers/base/power/shutdown.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/drivers/base/power/shutdown.c
> ===================================================================
> --- linux-2.6.orig/drivers/base/power/shutdown.c	2007-11-05 18:51:51.000000000 +0100
> +++ linux-2.6/drivers/base/power/shutdown.c	2007-11-05 18:52:50.000000000 +0100
> @@ -37,10 +37,11 @@ void device_shutdown(void)
>  	list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
>  				kobj.entry) {
>  		if (dev->bus && dev->bus->shutdown) {
> -			dev_dbg(dev, "shutdown\n");
> +			dev_dbg(dev, "shutdown (bus %s)\n", dev->bus->name);
>  			dev->bus->shutdown(dev);
>  		} else if (dev->driver && dev->driver->shutdown) {
> -			dev_dbg(dev, "shutdown\n");
> +			dev_dbg(dev, "shutdown (driver %s)\n",
> +				dev->driver->name);
>  			dev->driver->shutdown(dev);
>  		}
>  	}
> 
> and get as the kernel's last words:
> 
> <loads of sane shutdowns for the ccw and css busses>
>     <7>io_subchannel 0.0.095c: shutdown (bus css)
>     <7>io_subchannel 0.0.095b: shutdown (bus css)
>     <7>io_subchannel 0.0.095a: shutdown (bus css)
>     <7> : shutdown (bus )
>     <1>Unable to handle kernel pointer dereference at virtual kernel address 0000000500000000
>     <4>Oops: 003b [#1]
>     <4>Modules linked in: dm_multipath sunrpc qeth ccwgroup dm_mod
>     <4>CPU:    2    Not tainted
>     <4>Process reboot (pid: 2892, task: 0000000002cae048, ksp: 00000000045c39b8)
>     <4>Krnl PSW : 0704000180000000 0000000500000006 (0x500000006)
>     <4>           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3
>     <4>Krnl GPRS: 0000000000019e75 0000000500000006 0000000002c42810 0000000002c429b0
>     <4>           00000000002a36ec 0000000000000000 000003ffffb76d48 0000000000000160
>     <4>           00000000001423a4 000002000015e390 00000000006e06b8 0000000000634638
>     <4>           0000000002c42810 000000000041f670 00000000002a36fe 00000000045c3d00
>     <4>Krnl Code: Bad PSW.
>     <4>Call Trace:
>     <4>([<00000000002a36ec>] device_shutdown+0x78/0x144)
>     <4> [<000000000013f18c>] kernel_restart_prepare+0x44/0x50
>     <4> [<000000000013f1be>] kernel_restart+0x26/0x6c
>     <4> [<0000000000142548>] sys_reboot+0x1a4/0x1f4
>     <4> [<0000000000111038>] sysc_noemu+0x10/0x16
>     <4> [<00000200001048e0>] 0x200001048e0
>     <4>
>     <4> 
> 
> Huh? We want to shutdown an unknown device on a bus that wishes to stay
> anonymous?
> 
> Any hints would be appreciated...

I'll look into this, I wonder if we are walking off the end of an
unterminated list...

thanks,

greg k-h
-
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