linux-kernel - Re: [PATCH 0/2] driver core / ACPI: Avoid device removal locking problems

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Message-ID: <521EAB47.4060101@cn.fujitsu.com>
Date:	Thu, 29 Aug 2013 10:00:39 +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>,
	Tejun Heo <tj@...nel.org>, Toshi Kani <toshi.kani@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [PATCH 0/2] driver core / ACPI: Avoid device removal locking
 problems

Hi Rafael,

On 08/28/2013 09:45 PM, Rafael J. Wysocki wrote:

> Hi All,
> 
> The following two patches are to address possible deadlocks related to
> device removal and device sysfs attribute access.  In short, some device
> sysfs attribute callbacks need to acquire locks that are also held around
> device removal and that may lead to deadlocks with s_active draining in
> sysfs_deactivate().
> 
> [1/2] Avoid possible device removal deadlocks related to device_hotplug_lock.
> [2/2] Rework the handling of containers by ACPI hotplug (which makes a possible
>       device removal deadlock related to acpi_scan_lock go away).
> 

This version is concise and friendly. It works well on latest kernel tree, and all
the splat goes away.:)

Best regards,
Gu

> On top of linux-next, for v3.12.

> 
> Thanks,
> Rafael
> 
> 


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