linux-kernel - Re: [PATCH -v1] acpi: Fix possible recursive locking in hwregs.c

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Message-ID: <CADZ9YHhvSP2UEc8+burfsiykVbJDfi5n2p9Lb0nSpV2-WD5HzA@mail.gmail.com>
Date:	Thu, 3 Nov 2011 23:01:31 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Moore, Robert" <robert.moore@...el.com>
Subject: Re: [PATCH -v1] acpi: Fix possible recursive locking in hwregs.c

On 11/3/11, Lin Ming <ming.m.lin@...el.com> wrote:
> On Thu, 2011-11-03 at 18:48 +0800, Rakib Mullick wrote:
>> Calling pm-suspend might trigger a recursive lock in it's code path. In
>> function acpi_hw_clear_acpi_status,
>
> As I replied at https://lkml.org/lkml/2011/9/22/6, I still don't think
> there is a recursive lock.
>
> Or do you have a real test case to trigger the recursive lock you
> mentioned?
>
As I said before, recursive lock trigger's on a modified kernel (when
calling pm-suspend), not with the mainline kernel. If you think that,
since it's not happening with original kernel, so we shouldn't go for
fix - that's a different thing, I don't have any argue. But, the issue
is on.

Thanks,
Rakib
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