linux-kernel - Re: [Bug report] Warning when hot-add an ACPI0004 device.

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Date:	Wed, 25 Sep 2013 18:31:09 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	Tang Chen <tangchen@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [Bug report] Warning when hot-add an ACPI0004 device.

Hi Toshi,

On 09/12/2013 11:11 PM, Toshi Kani wrote:

> On Thu, 2013-09-12 at 13:00 +0800, Tang Chen wrote:
>> Hi Rafael, Toshi,
>>
>> When we hot-add an ACPI0004 device, we got the following warning:
>>
>> 	acpi ACPI0004:01: Attempt to re-insert
>>
>> The ACPI0004 device is a System Board in Fujitsu server, which has two
>> numa nodes (processors and memory).
>>
>> It seems that we reserved the ACPI_NOTIFY_DEVICE_CHECK event twice in
>> acpi_hotplug_notify_cb().
>>
>>
>> According to bisect, this happens after the following commit:
>>
>>  From 68a67f6c78b80525d9b3c6672e7782de95e56a83 Mon Sep 17 00:00:00 2001
>> From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
>> Date: Sun, 3 Mar 2013 23:05:55 +0100
>> Subject: [PATCH 1/1] ACPI / container: Use common hotplug code
>>
>> Switch the ACPI container driver to using common device hotplug code
>> introduced previously.  This reduces the driver down to a trivial
>> definition and registration of a struct acpi_scan_handler object.
>>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> Acked-by: Toshi Kani <toshi.kani@...com>
>> Tested-by: Toshi Kani <toshi.kani@...com>
>> ---
>>   drivers/acpi/container.c | 146 
>> ++++-------------------------------------------
>>   1 file changed, 10 insertions(+), 136 deletions(-)
>>
>>
>> I'm now investigating this problem. If you have any idea about why this
>> happens, please let me know.
> 
> With the above change, container devices use the common notify handler,
> which logs the warning message in question when it receives device check
> twice on a same device.  Before the change, the container-specific
> notify handler did not log this message in the same case (but considered
> it as an eject request).
> 
> So, I suspect that you are getting device check twice regardless of the
> kernel change.  Can you check KERN_DEBUG messages to see if that is the
> case?  The notify handler logs all events with KERN_DEBUG.

Follow your suggestion, we confirm that it really received ACPI_NOTIFY_
DEVICE_CHECK event*twice*, but the original ACPI container driver only
received once, does the common device hotplug code introduce another device
check? any idea?

Container uses common device hotplug code:
[  142.937724] IPv6: ADDRCONF(NETDEV_CHANGE): eth8: link becomes ready
[  674.975575] ACPI: \_SB_.LSB1: ACPI_NOTIFY_DEVICE_CHECK event          <<<<
[  674.991604] ACPI: \_SB_.LSB1: ACPI_NOTIFY_DEVICE_CHECK event		 <<<<	
[  675.613990] ACPI: PCI Root Bridge [UNC2] (domain 0000 [bus fd])
[  675.684970] acpi PNP0A03:01: ACPI _OSC support notification failed, disabling PCIe ASPM
[  675.780957] acpi PNP0A03:01: Unable to request _OSC control (_OSC support mask: 0x08)
[  675.874806] ACPI _OSC control for PCIe not granted, disabling ASPM
[  675.949005] pci_bus 0000:fd: Allocating resources
[  675.960145] ACPI: PCI Root Bridge [UNC3] (domain 0000 [bus fc])
[  676.031176] acpi PNP0A03:02: ACPI _OSC support notification failed, disabling PCIe ASPM
[  676.127129] acpi PNP0A03:02: Unable to request _OSC control (_OSC support mask: 0x08)
[  676.220943] ACPI _OSC control for PCIe not granted, disabling ASPM
[  676.295019] pci_bus 0000:fc: Allocating resources

Original ACPI container driver:
[ 1526.122933] Container driver received ACPI_NOTIFY_DEVICE_CHECK event <<<<
[ 1526.800646] ACPI: PCI Root Bridge [UNC2] (domain 0000 [bus fd])
[ 1526.871682] acpi PNP0A03:01: ACPI _OSC support notification failed, disabling PCIe ASPM
[ 1526.967878] acpi PNP0A03:01: Unable to request _OSC control (_OSC support mask: 0x08)
[ 1527.061891] ACPI _OSC control for PCIe not granted, disabling ASPM
[ 1527.136036] pci_bus 0000:fd: Allocating resources
[ 1527.150747] ACPI: PCI Root Bridge [UNC3] (domain 0000 [bus fc])
[ 1527.221821] acpi PNP0A03:02: ACPI _OSC support notification failed, disabling PCIe ASPM
[ 1527.317738] acpi PNP0A03:02: Unable to request _OSC control (_OSC support mask: 0x08)
[ 1527.411795] ACPI _OSC control for PCIe not granted, disabling ASPM
[ 1527.485917] pci_bus 0000:fc: Allocating resources


Thanks,
Gu

> 
> Thanks,
> -Toshi
> 
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