linux-kernel - Re: [PATCH] clockevents: Fix suspend/resume to disk hangs

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Date:	Sat, 17 Mar 2007 10:35:59 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	tglx@...utronix.de
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frédéric RISS <frederic.riss@...il.com>,
	Thomas Meyer <thomas@...3r.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Adrian Bunk <bunk@...sta.de>
Subject: Re: [PATCH] clockevents: Fix suspend/resume to disk hangs

Thomas Gleixner wrote:
> I finally found a dual core box, which survives suspend/resume without
> crashing in the middle of nowhere. Sigh, I never figured out from the
> code and the bug reports what's going on.
> 
> The observed hangs are caused by a stale state transition of the clock
> event devices, which keeps the RCU synchronization away from completion,
> when the non boot CPU is brought back up.
> 
> The suspend/resume in oneshot mode needs the similar care as the
> periodic mode during suspend to RAM. My assumption that the state
> transitions during the different shutdown/bringups of s2disk would go
> through the periodic boot phase and then switch over to highres resp.
> nohz mode were simply wrong.
> 
> Add the appropriate suspend / resume handling for the non periodic
> modes.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Hi,
I can confirm that this patch fixed the problem on Thinkpad X60s.

Thanks !

Milan
--
mbroz@...hat.com
 
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