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Date:	Tue, 05 Jan 2010 08:09:59 +0900
From:	Tejun Heo <>
To:	"Eric W. Biederman" <>
CC:	Dmitry Torokhov <>,
	Linus Torvalds <>,
	KOSAKI Motohiro <>,
	Borislav Petkov <>,
	David Airlie <>,
	Linux Kernel Mailing List <>,
	Greg KH <>, Al Viro <>
Subject: Re: drm_vm.c:drm_mmap: possible circular locking dependency detected


On 01/05/2010 04:43 AM, Eric W. Biederman wrote:
>>> So it is unlikely but possible to deadlock by accessing a serio
>>> attribute of a serio device that is being removed.
>> Hmm, I guess I was too quick dismissing lockdep complaints here. Now
>> that sysfs remove waits deadlock indeed is possible. Actually the locks
>> on serio->drv_mutex in attributes were added to make sure we don't
>> access device that was unbound from the driver through stale sysfs
>> attributes.
> Cool.  So we have solved the problem generically but we have left over
> layer specific solutions.  That seems like a good problem to have.

This is way too cool.  Only if we can have more moments like this.  :-)

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