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

[Milan Broz]

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@xxxxxxxxxxxxx>

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

Thanks !

Milan
--
mbroz@xxxxxxxxxx
 
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