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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