linux-kernel - Re: Possible issue with commit: "clockevents: Set noop handler in clockevents_exchange

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Message-ID: <4EF5ECA2.1040305@canonical.com>
Date:	Sat, 24 Dec 2011 08:15:46 -0700
From:	Tim Gardner <tim.gardner@...onical.com>
To:	tglx@...utronix.de
CC:	Joseph Salisbury <joseph.salisbury@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Possible issue with commit: "clockevents: Set noop handler in
 clockevents_exchange_device()"

On 12/23/2011 06:20 PM, Joseph Salisbury wrote:
> Hi Thomas,
>
> We have been working on a bug[1] that affects suspend/resume. After
> running some tests, it appears the regression has to do with a commit
> you submitted:
>
>
> commit b01b383bbd04e9dcf7d9fe6ca3751b77ccdc533c
> Author: Thomas Gleixner <tglx@...utronix.de>
> Date: Fri Dec 2 16:02:45 2011 +0100
>
> clockevents: Set noop handler in clockevents_exchange_device()
>
> commit de28f25e8244c7353abed8de0c7792f5f883588c upstream.
>
> If a device is shutdown, then there might be a pending interrupt,
> which will be processed after we reenable interrupts, which causes the
> original handler to be run. If the old handler is the (broadcast)
> periodic handler the shutdown state might hang the kernel completely.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
>
>
> We tested with this commit reverted in the 3.0.13 kernel and the
> suspend/resume bug went away. We also tested the 3.2-rc6 kernel with
> this commit reverted and the bug went away there as well.
>
> I wanted to let you know about this issue and see if there is any
> additional details you might need from me.
>
> Thanks,
>
> Joe
>
>
>
> [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/904569
>

To be clear, this regression appears to exist in the 3.2-rc6: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/904569/comments/24

Cc'ing LKML

rtg
-- 
Tim Gardner tim.gardner@...onical.com
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