Messages in this thread | | | Date | Wed, 23 May 2007 20:21:25 +0400 | From | Oleg Nesterov <> | Subject | Re: 2.6.22-rc2-mm1 |
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On 05/23, Alan Stern wrote: > > Okay, it's clear that the two threads are in deadlock. It's not clear > how the deadlock arose to begin with -- apparently there was a remote > wakeup request for a root hub at the same time as a device below that > root hub was disconnected, which doesn't make much sense.
Please note that this flush_workqueue() was not safe anyway. We are freezing tasks, and ksuspend_usb_wq is freezeable. So, it could be frozen before "khubd" task, and we have another deadlock.
> Anyway, this looks like a good place to use cancel_work_sync(). The
Could you use cancel_rearming_delayed_work() ? (It should be renamed to cancel_delayed_work_sync()).
Oleg.
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