linux-kernel - Re: [PATCH] driver core / ACPI: Avoid device removal locking problems

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Message-ID: <521C6FA8.4070804@cn.fujitsu.com>
Date:	Tue, 27 Aug 2013 17:21:44 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Toshi Kani <toshi.kani@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] driver core / ACPI: Avoid device removal locking problems

Hi Rafael,

On 08/26/2013 11:02 PM, Rafael J. Wysocki wrote:

> On Monday, August 26, 2013 04:43:26 PM Rafael J. Wysocki wrote:
>> On Monday, August 26, 2013 02:42:09 PM Rafael J. Wysocki wrote:
>>> On Monday, August 26, 2013 11:13:13 AM Gu Zheng wrote:
>>>> Hi Rafael,
> 
> [...]
> 
>>
>> OK, so the patch below is quick and dirty and overkill, but it should make the
>> splat go away at least.
> 
> And if this patch does make the splat go away for you, please also test the
> appended one (Tejun, thanks for the hint!).
> 
> I'll address the ACPI part differently later.

What about changing device_hotplug_lock and acpi_scan_lock to rwsem? like the
attached one(With a preliminary test, it also can make the splat go away).:)

Regards,
Gu

> 
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