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Date:	Sun, 03 Jan 2010 03:14:18 -0800
From: (Eric W. Biederman)
To:	Dmitry Torokhov <>
Cc:	Tejun Heo <>,
	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 (Eric W. Biederman) writes:

> What to do about it is another question.   It has just recently come to my
> attention that we have more events like this

In the specific case of serio what gets us in trouble is
the call to sysfs_remove_group.

If instead of independent calls to sysfs_create_group/sysfs_remove_group,
you could move the groups into a list on dev->groups than we could solve
two problems.

- Userspace would see all of the attributes when the hotplug event is
  fired remove races.

- We would not hold serio->drv_mutex over sysfs_remove_group so there
  would not be a possible deadlock on device removal.

Does that change sound possible?


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