Messages in this thread | | | Date | Wed, 10 Jul 2013 14:04:50 +0800 | From | Michael Wang <> | Subject | Re: [v3.10 regression] deadlock on cpu hotplug |
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On 07/10/2013 01:39 PM, Viresh Kumar wrote: > On 10 July 2013 09:42, Michael Wang <wangyun@linux.vnet.ibm.com> wrote: >> I'm not sure what is supposed after notify CPUFREQ_GOV_STOP event, if it >> is in order to stop queued work and prevent follow work happen again, >> then it failed to, and we need some method to stop queue work again when >> CPUFREQ_GOV_STOP notified, like some flag in policy which will be >> checked before re-queue work in work. >> >> But if the event is just to sync the queued work but not prevent follow >> work happen, then things will become tough...we need confirm. > > After GOV_STOP, until the time GOV_START is called, we shouldn't be > queuing any work.
Thanks for the confirm :) seems like the root cause is very likely related with the problem Srivatsa discovered.
I think the fix in his mail worth a try, but I need more investigations to confirm that's the right way...
Regards, Michael Wang
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