linux-kernel - Re: [BUG?] recursive locking in acpi_bus_register

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Message-ID: <2375c9f91002081813w32a59b29l42c734cb2271324c@mail.gmail.com>
Date:	Tue, 9 Feb 2010 10:13:21 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan.kim@...il.com>, Len Brown <lenb@...nel.org>,
	inux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>
Subject: Re: [BUG?] recursive locking in acpi_bus_register_driver

On Tue, Feb 9, 2010 at 4:48 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Fri, 5 Feb 2010 15:58:07 +0900
> Minchan Kim <minchan.kim@...il.com> wrote:
>
>> Is this a known bug or my hardware is bad ?
>> I use mmotm 2010-02-03-20-09.
>>
>> I didn't have a problem in 2.6.32.
>> Unfortunately I can't test it at next week.
>> I hope this problem can be reproduced easily.
>>
>
> It would be useful if you could work out whether this bug is only in
> -mm, or is in linux-next or is in mainline, please.
>
> Probably it's in linux-next, and it might be due to driver core changes
> or acpi changes.
>

Due the convert from semphore to mutex in driver core code, I think.
This is a known issue.

> Either way, we should get this weeded out lest the offending code turns
> up in 2.6.34-rc1.

Alan Stern is working on this, the patch he provided still needs to be
discussed, I think.
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