Oleg Nesterov wrote:
cancel_rearming_delayed_workqueue(dwork) will hang forever if dwork was not scheduled, because in that case cancel_delayed_work()->del_timer_sync() never returns true.
Thanks! We hit this problem before with the zd1211rw driver and avoided using cancel_rearming_delayed_workqueue() for this reason. I never did get around to looking into if the function itself could be fixed, although I see not much effort would have been needed :)
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