linux-kernel - Re: [PATCH] thinkpad-acpi: fix potential suspend blocking issue

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Message-ID: <20130306155039.GB7697@redhat.com>
Date:	Wed, 6 Mar 2013 16:50:39 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mandeep Singh Baines <msb@...omium.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	ibm-acpi@....eng.br, ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, Aaron Lu <aaron.lu@...el.com>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Tejun Heo <tj@...nel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Artem Savkov <artem.savkov@...il.com>
Subject: Re: [PATCH] thinkpad-acpi: fix potential suspend blocking issue

On 03/05, Andrew Morton wrote:
>
> Basically the same as
> http://ozlabs.org/~akpm/mmots/broken-out/drivers-platform-x86-thinkpad_acpic-move-hotkey_thread_mutex-lock-after-set_freezable.patch.
>  I think Artem's patch is a little better.  There doesn't appear to be
> any locking protocol for tpacpi_lifecycle.

Which seems to have the same problem, hotkey_kthread() still calls
kthread_freezable_should_stop() under hotkey_thread_mutex.

IOW, we have two try_to_freeze's here, the patch moves only one of
them outside of the hotkey_thread_mutex.

Oleg.

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